题目内容

When ________ through a telescope, the sun appears darker near the edge.

A. seeing
B. being seen
C. seen
D. see

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Knowing the property of the machine is ________ we must do before using it.

A. that
B. what
C. because
D. because of

If he wants people to understand him, he should avoid using big words and ________ to make what he says interesting.

A. try
B. trying
C. tries
D. to try

无氧耐力是指机体在()的情况下,能坚持()时间工作的能力。

A. 缺氧
B. 有氧
C. 较长

进行柔韧练习时,一般当外界温度在18度时,训练效果最佳。

A. 对
B. 错