单项选择题

Comparison and contrast are often used （）in advertisements.

A．intentionally
B．pertinently
C．incidentally
D．tiresomely

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单项选择题
Some fish have a greater （）for acid water than others.

A．tolerance
B．resistance
C．dependence
D．persistence
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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