单项选择题

The government has devoted a large slice of its national ______ to agriculture than most other countries.

A．resources
B．potential
C．budget
D．economy
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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
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
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