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There are many ways to define the “time” at a particular ______.Here，on Earth our usual system is defined by the motion of the Sun in the sky.
A.district
B.iocation
C.interpretation
D.direction
B.iocation
C.interpretation
D.direction
参考答案
参考解析
解析：选项A意为“地区”；选项B意为“位置”；选项C意为“解释，说明”；选项D意为“方向”。 根据题干，题目意为“有许多方法可以定义特定位置的‘时间’”。在地球上，我们通常是由天空中太阳的运动来定义的。”因此，选项B符合题意。
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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
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共用题干
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Living creatures on another planet would probably have the same appearance as those on Earth.B
Life cannot exist on other planets in our solar system.C
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motion of the Earth in its orbitB
rotation of the Earth on its axisC
the body's orbital motion during the time required for its light to reach the EarthD
a false horizon
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a fictitious sun moving along the celestial equatorB
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the movement of the first point of Aries
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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
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SetsB
WorkflowC
Cron TaskD
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IhadbeenB
IamcomingC
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refraction of light as it enters the Earth's atmosphereB
rotation of the Earth on it's axisC
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a false horizon
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