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單項(xiàng)選擇題

（）with the size of the whole earth, the highest mountains do not seem high at all.

A.If you compare
B.Compare them
C.When compared
D.A comparison

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單項(xiàng)選擇題

It is useful to science（）the earth as an object in space.

A.to consider
B.which considers
C.considers
D.the consideration of

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We must（）that the experiment is controlled as rigidly as possible.

A.assure
B.secure
C.ensure
D.issue

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