题目内容
（请给出正确答案）
(That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages.
A．That
B．but
C．is
D．was
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更多“（That) the sun （but) not the e…”相关的问题
Which of the following statements in supported by the passage？
A．The sun shines constantly and gives out the same amount of energy every year．
B．The cause of the sun’S fluctuations is its loss of energy with each passing year
C．It is sure that the energy sent out by the sun will drop when more sun spots appear．
D．Fluctuations in weather pattems are the results of the pull of gravity．
A. the star moved away from the sun
B. another star happened to come near the sun
C. fhe sun and the moon raised the tides on the earth
D. a large tidal wave of a star travelled over the surface of the sun
The sun warms the earth, ______ makes it possible for plants to grow.
A．this
B．that
C．as
D．which
The principal idea of this article is ______.
A．the attraction of the sun and the moon
B．the sun, the moon and the wind
C．the changing tide
D．the factors affecting the tide
The sun's energy provides us with all EXCEPT _______.
A．rain
B．teal
C．water
D．light
