单项选择题

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

A．magnifying
B．multiplying
C．breeding
D．generating
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单项选择题
The customer______ whether the articles exhibited in the shop were for sale.
A．acquired
B．required
C．inquired
D．requested
单项选择题
Whenever possible, Ian______ how well he speaks Japanese.
A．shows up
B．shows around
C．shows off
D．shows out
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