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單項選擇題

The scientists are（）a series of experiments to learn more about how the body adapts to weightlessness.

A.defining
B.having
C.carrying
D.doing

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單項選擇題

The red flower goes from one to（）in the class.

A.the other
B.others
C.another
D.other

單項選擇題

The rain was（）make our picnic impossible.

A.hard enough
B.hard so to
C.so hard as to
D.so hard to