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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1.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

2.單項(xiàng)選擇題We must()that the experiment is controlled as rigidly as possible.

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