单项选择题

In the flint decades of the twentieth century, the individual gem could not be seen, but could be worked with fruitfully.

A．blindly
B．completely
C．productively
D．carefully
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单项选择题
The environmental balance among ecological communities is exceedingly complex.
A．almost
B．successfully
C．extremely
D．rarely
单项选择题
Giving the child problems he cannot solve will only frustrate him.
A．baffle
B．worry
C．alarm
D．cultivate
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