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
In American universities, classes are often arranged in more flexible ______ and many jobs on campus are reserved for students.
A．scales
B．patterns
C．grades
D．ranks
单项选择题
One of his eyes was injured in an accident, but after a ______ operation, he quickly recovered his sight.
A．delicate
B．considerate
C．precise
D．sensitive
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