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
（38）（）

A. transmissions
B. transactions
C. transformations
D. transportations
单项选择题
The vast majority of people in any given culture will （） to established standards of that culture.

A. confine
B. conform
C. confront
D. confirm
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