單項選擇題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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1.單項選擇題We must()that the experiment is controlled as rigidly as possible.
A.assure
B.secure
C.ensure
D.issue
2.單項選擇題Be careful,()you'll fall down.
A.on the contrary
B.or rather
C.or else
D.as for
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