The sun heats the earth,（）is very important to living things.A、thatB、whatC、which
The sun heats the earth,（）is very important to living things.
- A、that
- B、what
- C、which
相关考题：
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
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
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
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
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
protective blanket 选择 Theatmosphereagainactsourprotectiveblanketon_____[A]stars[B]sun[C]earth[D]space
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
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.velocityB.orbitC.weightD.diameter
Due to the tilt of Neptune's axis,the Sun heats the planet's northern and southemhemispheres unequally.A:climatesB:halvesC:atmospheresD:contours
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
单选题Neap tides occur（）.AAt the start of spring，when the Sun is nearly over the equatorBOnly when the Sun and Moon are on the same sides of the Earth and are nearly in lineCWhen the Sun and Moon are at approximately 90° to each other，as seen from the EarthDWhen the Sun，Moon，and Earth are nearly in line，regardless of alignment order
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（）.AelongationBconjunctionCoppositionDquadrature
单选题Opposition occurs when（）.Athe Sun，Earth，and Moon are at right anglesBthe Sun's declination is 0°and is moving southCan inferior planet is at the maximum angle to the line of sight to the SunDthe Earth is between a planet and the Sun
单选题Spring tides occur（）.Aat the start of spring，when the Sun is nearly over the equatorBonly when the Sun and Moon are on the same side of the Earth and nearly in lineCwhen the Sun and Moon are at approximately 90°to each other as seen from the EarthDwhen the Sun，Moon，and Earth are nearly in line，in any order
单选题Perihelion is the point where the Sun（）.Ais nearest to the EarthBis farthest from the EarthCis on the opposite side of the Earth from the MoonDand Moon and Earth are in line
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?（）AThe motion of the apparent sun is along the eclipticBMeasurement of time is along the celestial equatorCThe speed of the Earth's revolution is not constantDThere are variations in the Earth's rotational speed
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.AwarmsBwarmedCwarmingDto warm
单选题Superior conjunction occurs when（）.Athe Sun is at maximum declination north or southBa planet crosses the external plane of the eclipticCthe Sun is between the Earth and a planetDtwo planets are in line
单选题We learn from the passage that ______.Aall living things on the earth depend on the sun for their foodBa forest looks dark in winter because it absorbs solar energyConly 0.023 of the energy from the sun is made use of on the earthDgreenhouse gases allow heat energy to escape from the earth’ s surface
单选题Aphelion is the point where the Sun（）.Aand Moon and Earth form a right angleBand Moon and Earth are in lineCcrosses the celestial equatorDis farthest from the Earth
填空题Earth would not have developed without the Sun.____