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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单项选择题
Recent studies have identified four major global environmental risks; acid rain, ozone depletion, deforestation and the greenhouse effect.
A．recognized
B．proved
C．got rid of
D．multiplied
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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