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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
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單項(xiàng)選擇題

Be careful,（）you'll fall down.

A.on the contrary
B.or rather
C.or else
D.as for