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The sun heats the earth,（）is very important to living things.
- A、that
- B、what
- C、which
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更多 “The sun heats the earth,（）is very important to living things.A、thatB、whatC、which” 相关考题
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The article suggests that______.A. our earth exists before the sunB. how space formedC. no one knows where the earth comes fromD. our earth used to be part of a high mountain on the sun
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It is stated in astrology that ________.[A] the sun is so distant from us that it was hard to follow its motion[B] the sun was moving westward around the sky[C] the motion of the sun is at the rate of about thirty degrees every week[D] the motion of the sun is similar to the revolution of the earth around the sun
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All the other five planets ________.[A] always appear near the path of the sun[B] are moving in a way more complicated than the earth does[C] aren't moving around the sun as independently as the earth does[D] are moving around the sun at the same speed as the earth does
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It is a common sense that the earth is ( ).
A、one of the suns’ planetsB、one of the sun's planetsC、one of the sun’s planetD、one of the suns’ planet’s
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Neap tides occur ______.A.at the start of spring, when the Sun is nearly over the equatorB.only when the Sun and Moon are on the same sides of the Earth and are nearly in lineC.when the Sun and Moon are at approximately 90°to each other, as seen from the EarthD.when the Sun , Moon, and Earth are nearly in line, regardless of alignment order
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protective blanket 选择
Theatmosphereagainactsourprotectiveblanketon_____[A]stars[B]sun[C]earth[D]space
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A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?A.The motion of the apparent sun is along the eclipticB.Measurement of time is along the celestial equatorC.The speed of the Earth's revolution is not constantD.There are variations in the Earth's rotational speed
考题
Mercury’s（ ）is so much greater than the Earth’s that it completes more than four revolutions around the Sun in the time it takes the Earth to complete one.A.velocity
B.orbit
C.weight
D.diameter
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Due to the tilt of Neptune's axis,the Sun heats the planet's northern and southemhemispheres unequally.A:climates
B:halves
C:atmospheres
D:contours
考题
共用题干
Early Ideas about the Universe1 Early man got his ideas about the universe by looking at the stars as you do.He observed carefully,and learned many things about the sun,the moon,and the stars.2 Suppose you were asked to collect evidence about the sun as early man did.You might go out morning after morning and see it come up in the east.Even on cloudy mornings,youwould observe that the darkness goes away and the world becomes light.You might not see the sun but would be sure it is there,because you notice that the earth warms up.As you continued,the sun climbs higher in the sky each day during part of the year. It stays in the sky longer. The earth gets warmer. Things begin to grow. It is spring and then summer.3 After a while the sun stays in the sky for shorter and shorter periods.Many plants begin to die.Leaves fall.Winter comes.Year after year this is repeated and you cannot tell exactly why it happens.But you realize that the sun seems to make the difference. Primitive（原始的）man felt that since the sun was so powerful it must be a god. It may seem silly to us now to worship（崇拜）a sun-god, but primitive man was right about the importance of the sun to life on earth.4 You have been told that the world is round.But suppose no one had ever taught you that the world was like a huge ball.Would you have ever thought of it yourself?You cannot see the curve（曲线）of the earth at once. You would have no idea of how big it was. That's why early man believed that the earth was small and flat.Such ideas appeared from the evidence they had.5 If you watch the stars night after night,you will see them rise and set.As you look at the sky,it is not difficult to imagine that you are in the center of a vast collection of twinkling（闪烁）lights. Some early astronomers（天文学家）believed the sky was a crystal shell or series of crystal shells,one inside the other. They believed this because that is what the night sky looked like.For many centuries,men believed that the earth was the center of the universe and that the sun,the moon,and the stars circled around it.Early man thought the earth was small and flat because_________.A:he did not observe the sun carefully enoughB:he could not see its curveC:the sun,the moon and the stars seemed to move around itD:the earth circles around the sunE:it looked like that at nightF:it has power over life on earth
考题
单选题Neap tides occur（）.A
At the start of spring，when the Sun is nearly over the equatorB
Only when the Sun and Moon are on the same sides of the Earth and are nearly in lineC
When the Sun and Moon are at approximately 90° to each other，as seen from the EarthD
When the Sun，Moon，and Earth are nearly in line，regardless of alignment order
考题
单选题As observed from the Earth，the angle between lines from the Earth to the Sun and the Earth to an inferior planet is known as（）.A
elongationB
conjunctionC
oppositionD
quadrature
考题
单选题Opposition occurs when（）.A
the Sun，Earth，and Moon are at right anglesB
the Sun's declination is 0°and is moving southC
an inferior planet is at the maximum angle to the line of sight to the SunD
the Earth is between a planet and the Sun
考题
单选题Spring tides occur（）.A
at the start of spring，when the Sun is nearly over the equatorB
only when the Sun and Moon are on the same side of the Earth and nearly in lineC
when the Sun and Moon are at approximately 90°to each other as seen from the EarthD
when the Sun，Moon，and Earth are nearly in line，in any order
考题
单选题Perihelion is the point where the Sun（）.A
is nearest to the EarthB
is farthest from the EarthC
is on the opposite side of the Earth from the MoonD
and Moon and Earth are in line
考题
单选题A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）A
The motion of the apparent sun is along the eclipticB
Measurement of time is along the celestial equatorC
The speed of the Earth's revolution is not constantD
There are variations in the Earth's rotational speed
考题
单选题Without the sun’s light _____ the earth’s surface, it would be so cold that life could not exist on the earth.A
warmsB
warmedC
warmingD
to warm
考题
单选题Superior conjunction occurs when（）.A
the Sun is at maximum declination north or southB
a planet crosses the external plane of the eclipticC
the Sun is between the Earth and a planetD
two planets are in line
考题
单选题We learn from the passage that ______.A
all living things on the earth depend on the sun for their foodB
a forest looks dark in winter because it absorbs solar energyC
only 0.023 of the energy from the sun is made use of on the earthD
greenhouse gases allow heat energy to escape from the earth’ s surface
考题
单选题Aphelion is the point where the Sun（）.A
and Moon and Earth form a right angleB
and Moon and Earth are in lineC
crosses the celestial equatorD
is farthest from the Earth
考题
填空题Earth would not have developed without the Sun.____
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