单项选择题

It is true that ______ a wild plant into a major food crop such as wheat requires much research time.

A. multiplying
B. breeding
C. magnifying
D. generating
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单项选择题
The governments agree to ______ its original plan in spite of the resistance.
A. keep with
B. tangle with
C. adhere to
D. devote to
单项选择题
A terrible air crash occured; people were saddened when they watched the ______ sight on TV.
A. panic
B. patriotic
C. pathetic
D. periodic
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