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In some cases, when a predator approaches, fishes escape on hearing ______.
A. the sounds of other species
B. the sounds of their prey
C. the sounds of the approaching enemy
D. the sounds of their fellows
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更多 “ In some cases, when a predator approaches, fishes escape on hearing ______.A. the sounds of other speciesB. the sounds of their preyC. the sounds of the approaching enemyD. the sounds of their fellows ” 相关考题
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Passage FourMost people do not think of fishes and other sea animals as having voices, and of those who are aware of the fact that many of them can "speak", few understand that these "conversations" have significance. Actually, their talk may be as meaningful as much of our own. For example, some sea animals use their "voices" to locate their food in the ocean expanses (广阔的区域); others use their "voices" to let their fellows know of their locations; and still others, as a means of obtaining mates. Sometimes, "speaking" may even mean the difference between life and death to a sea animal. It appears in some cases that when a predator (食肉动物) approaches, the prey (被捕的动物) depends on no more than the sounds it makes to escape.Fish sounds are important to man, also. By listening to them, he can learn a great deal about he habits of creatures that make them, the size of the School they form, the patterns of their migrations, and the nature of the environments in which they live. He can also apply this nformation to the more effective utilization of the listening spots he has set up to detect enemy submarines (潜水艇). A knowledge of fish sounds can avoid confusion and unneeded effort when a "new" sound is picked up and the sound sentry (哨兵) must decide whether or not to call an alarm.46. Among the people who know that many sea animals have voices, few ______.A. know the meaning of their conversationsB. realize that they can communicate with each otherC. realize that they can make speechesD. could understand their conversations
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In some cases,different approaches（ ）conflicting theories.the same scientific problem lead to
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B.are
C.has
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A. close
B. narrow
C. hard
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B.consistency
C.joke
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In a world where it seems we already have too much to do，and too many things to think about，it seems the last thing we need is something new that we have to learn.But use cases do solve a problem with requirements:with（ ）declarative equirements it's hard to describle steps and sequences of events.Use cases，stated simply，allow description of sequences of events that，taken together，lead to a system doing something useful.As simple as this sounds，this is important.When confronted only with a pile of requiements，it's often（ ）to make sense of what the authors of the requirements really wanted the system to do.In the preceding example，use cases reduce the ambiguity of the requirements by specifying exactly when and under what conditions certain behavior occurs;as such，the sequence of the behaviors can be regarded as a requirement.Use cases are particularly well suited to capture approaches.Although this may sound simple，the fact is that（ ）equirement capture approaches，with their emphasis on declarative requirements and"shall"statements，completely fail to capture the（ ）of the system's behavior.Use cases are a simple yet powerful way to express the behavior of the system in way that all stakeholders can easily understand.But，like anything，use cases come with their own problems，and as useful as they are，they can be（请作答此空）.the result is something that is as bad，if not worse，that the original problem.Therein it's important to utilize use cases effectively without creating a greater problem than the one you started with.A.misapplied
B.applied
C.used
D.powerful
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In a world where
it seems we already have too much to do, and too many things to think about, it
seems the last thing we need is something new that we have to learn.
But use cases do
solve a problem with requirements:with （71） declarative requirements it's hard to describe steps and sequences of
events.
Use cases, stated
simply, allow description of sequences of events that, taken together, lead to
a system doing something useful.As simple as this sounds,this is important.
When confronted only with a pile of requiements, it's often（72）to make sense of what the authors of the
requirements really wanted the system to do.In the preceding example, use cases
reduce the ambiguity of the requirements by specifying exactly when and under
what conditions certain behavior occurs;as such, the sequence of the behaviors can
be regarded as a requirement. Use cases are particularly well suited to capture
approaches. Although this may sound simple, the fact is that （73） requirement capture approaches, with their
emphasis on declarative requirements and "shall"
statements,completely fail to capture fail to capture the （74） of the system's behavior. Use cases are a
simple yet powerful way to express the behavior of the system in way that all
stakeholders can easily understand.
But,like
anything, use cases come with their own problems, and as useful as they
are,they can be （75）. The result is something that is as bad, if not worse, that the original
problem.Therein it's important to utilize use cases effectively without
creating a greater problem than the one you started with.A.misapplied
B.applied
C.used
D.powerful
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共用题干
The SeaWhat do you know about the sea?We know that it looks very pretty when the sun is shining on it.We also know that it can be very rough when there is a strong wind.What other things do we know about it?The first thing to remember is that the sea is very big.When you look at the map of the world you will find there is more water than land.The sea covers three quarters of the world.The sea is also very deep in some places.It is not deep everywhere.Some parts of the sea are very shal-low.But in some places the depth of the sea is very great.There is one spot,near Japan,where the sea is nearly 11 kilometers deep!The highest mountain in the world is about 9 kilometers high.If that mountainwere put into the sea at that place,there would be 2 kilometers of water above it！What a deep place!If you have swum in the sea,you know that it is salty.You can taste the salt,Rivers,which fi0w into the sea.carry salt from the land into the sea.Some parts of the sea are saltier than other parts,There i、one sea,called the Dead Sea,which is very salty.It is so salty that swimmers cannot sink!Fish cannot live in theDead Sea!In most parts of the sea,there are plenty of fishes and plants.Some live near the top of the sca.Othurslive deep down.There are millions of tiny living things that float in the sea.These floating things are so smallthat it is hard to see them.Many fish live by eating them.The sea can be very cold.Divers,who go deep down in the sea,know this.On the top the water may bewarm.When the diver goes downwards,the sea becomnes colder and colder. Another thing happens.When the diver goes deeper,the water above presses down on him.It squeezes him.Then the diver has to wear clothesmade of metal.But he cannot go very deep.Some people who wanted to go very deep used a very strong diving ship!They went down to the deepest part of the sea in it.They went down to a depth of eleven kilometers!The deeper one goes down in the sea,the fewer fishes and plants he can find.A:RightB:WrongC:Not mentioned
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In which three cases does a checkpoint occur？ （）A、Every three minutes.B、When a log switch occurs.C、When forces by an administrator.D、When a tablespace is taken offline normal.E、When the redo buffer is one-third full.
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单选题When he was a young boy, a serious disease deprived him of the（）of hearing.A
organB
possessionC
conductD
faculty
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单选题The passage is primarily concerned with ______.A
informing readers of different sea creaturesB
describing predatory microscopic organismsC
solving some long-lasting mysteries about the seaD
discussing the environment for various fishes
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单选题When ____ is produced, complete closure of the articulators is involved so that the air stream cannot escape through the mouth.A
fricativeB
stopC
affricateD
lateral
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单选题In some cases the organisms that cause blood poisoning enter the bloodstream through contaminated needles or other improperly sterilized instruments.A
contactedB
infectedC
contagiousD
infectious
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判断题Fish is the least energy-efficient because most fossil fuel is required in order to catch some fishes.A
对B
错
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单选题The development goals for a large marine engine are many often interact and in some cases even with each other（）A
conflictB
accordC
harmonizeD
struggle
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