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A) rings
B) cycles
C) circles
D) rounds
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Sharks Perform a Service for Earth's WatersIt is hard to get people to think of sharks as anything but a deadly enemy. They are thought to1people frequently. But these fish perform a2service for earth's waters and for human beings. Yet business and sport fishing are threatening their3.Some sharks are at risk of disappearing from4.Warm weather may influence both fish and shark activity. Many fish swim near coastal areas5their warm waters. Experts say sharks may follow the fish into the same areas,6people also swim. In fact,most sharks do not purposely charge at or bite humans. They are thought to mistake a person7a sea animal,such as a seal or sea lion. That is why people should not swim in the ocean when the sun goes down or comes up.Those are the8 when sharks are looking for food. Experts also say that bright colors and shiny jewelry may cause sharks to attack.A shark has an extremely good sense of smell. It can find small amounts of substances in wa-ter,such as blood,body liquids and9 produced by animals. These powerful10help sharks find their food. Sharks eat fish,any11sharks,and plants that live in the ocean.Medical researchers want to learn more about the shark's body defense,and immune 12against disease. Researchers know that sharks13quickly from injuries. They study the shark in hopes of finding a way to fight human disease.Sharks are important for the world's14.They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too15．This protects the plants and other forms of life that exist in the oceans.12._________A: systems B: processes C: ideas D: circles
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades._________ (46 ) But from high above,these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1,500 years old,but their purpose is still a mystery.__________(47)However,it would probably be very tricky to land a spaceship in the middle ofpictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle（记 录）of the movement of the stars and planets._________(48)Later,an astronomer tested his theory with a computer,but he couldn' t find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. _________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area._________(50)_________(49)A:Scholars differ in interpreting the purpose of the designs.B:The largest picture may have been the sites for special ceremonies.C:He called Nazca"the largest astronomy book in the world".D:A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.E:Other scientists are now searching for evidence to prove this.F:Seen from the ground,it looks like lines scratched into the earth.
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades._________ (46 ) But from high above,these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1,500 years old,but their purpose is still a mystery.__________(47)However,it would probably be very tricky to land a spaceship in the middle ofpictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle（记 录）of the movement of the stars and planets._________(48)Later,an astronomer tested his theory with a computer,but he couldn' t find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. _________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area._________(50)_________(50)A:Scholars differ in interpreting the purpose of the designs.B:The largest picture may have been the sites for special ceremonies.C:He called Nazca"the largest astronomy book in the world".D:A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.E:Other scientists are now searching for evidence to prove this.F:Seen from the ground,it looks like lines scratched into the earth.
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades._________ (46 ) But from high above,these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1,500 years old,but their purpose is still a mystery.__________(47)However,it would probably be very tricky to land a spaceship in the middle ofpictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle（记 录）of the movement of the stars and planets._________(48)Later,an astronomer tested his theory with a computer,but he couldn' t find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. _________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area._________(50)_________(46)A:Scholars differ in interpreting the purpose of the designs.B:The largest picture may have been the sites for special ceremonies.C:He called Nazca"the largest astronomy book in the world".D:A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.E:Other scientists are now searching for evidence to prove this.F:Seen from the ground,it looks like lines scratched into the earth.
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades.__________ (46) But from high above, these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1 ,500 years old,but their purpose is still a mystery. ____________(47)However,it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle （记录）of the movement of the stars and planets.__________(48) Later, an astronomer tested his theory with a computer,but he couldn't find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. __________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area.________(50)__________（50）A:Other scientists are now searching for evidence to prove this.B:A Swiss writer named Erich Von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.C:Scholars differ in interpreting the purpose of the designs.D:The largest pictures may have been the sites for special ceremonies.E:Seen from the ground,it looks like lines scratched into the earth.F:He called Nazca"the largest astronomy book in the world".
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades.__________ (46) But from high above, these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1 ,500 years old,but their purpose is still a mystery. ____________(47)However,it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle （记录）of the movement of the stars and planets.__________(48) Later, an astronomer tested his theory with a computer,but he couldn't find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. __________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area.________(50)__________（49）A:Other scientists are now searching for evidence to prove this.B:A Swiss writer named Erich Von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.C:Scholars differ in interpreting the purpose of the designs.D:The largest pictures may have been the sites for special ceremonies.E:Seen from the ground,it looks like lines scratched into the earth.F:He called Nazca"the largest astronomy book in the world".
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades.__________ (46) But from high above, these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1 ,500 years old,but their purpose is still a mystery. ____________(47)However,it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle （记录）of the movement of the stars and planets.__________(48) Later, an astronomer tested his theory with a computer,but he couldn't find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. __________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area.________(50)__________（46）A:Other scientists are now searching for evidence to prove this.B:A Swiss writer named Erich Von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.C:Scholars differ in interpreting the purpose of the designs.D:The largest pictures may have been the sites for special ceremonies.E:Seen from the ground,it looks like lines scratched into the earth.F:He called Nazca"the largest astronomy book in the world".
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades.__________ (46) But from high above, these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1 ,500 years old,but their purpose is still a mystery. ____________(47)However,it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle （记录）of the movement of the stars and planets.__________(48) Later, an astronomer tested his theory with a computer,but he couldn't find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. __________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area.________(50)__________（47）A:Other scientists are now searching for evidence to prove this.B:A Swiss writer named Erich Von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.C:Scholars differ in interpreting the purpose of the designs.D:The largest pictures may have been the sites for special ceremonies.E:Seen from the ground,it looks like lines scratched into the earth.F:He called Nazca"the largest astronomy book in the world".
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The Mysteries of NazcaIn the desert of Peru,300 kilometers from Lima,one of the most unusual artworks in the world has mystified（迷惑）people for decades.__________ (46) But from high above, these marks are huge images of birds,fish,seashells,all beautifully carved into the earth.The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all,there are about 70 different human and animal figures on the plain,along with 900 triangles,circles,and lines.Researchers have figured out that the lines are at least 1 ,500 years old,but their purpose is still a mystery. ____________(47)However,it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.In the 1940s,an American explorer named Paul Kosok suggested that the drawings are a chronicle （记录）of the movement of the stars and planets.__________(48) Later, an astronomer tested his theory with a computer,but he couldn't find any relation between the lines and movements in space.Another explanation is that the lines may have been made for religious reasons.British researcher Tony Morrison investigated the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road.It's possible that in the past,the lines of Nazca were created for a similar purpose. __________(49)But the local people have never constructed anything this big.Recently,two other scientists,David Johnson and Steve Mabee,have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area,he noticed that some waterways built by ancient people were connected with the lines.Johnson believes that the Nazca lines are a giant map of the underground water in the area.________(50)__________（48）A:Other scientists are now searching for evidence to prove this.B:A Swiss writer named Erich Von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.C:Scholars differ in interpreting the purpose of the designs.D:The largest pictures may have been the sites for special ceremonies.E:Seen from the ground,it looks like lines scratched into the earth.F:He called Nazca"the largest astronomy book in the world".
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