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
Giving the child problems he cannot solve will only frustrate him.
A．baffle
B．worry
C．alarm
D．cultivate
单项选择题
Perhaps more than anything else, it was onerous taxes that led to the Peasants' Revolt in England in 1381.
A．multiple
B．unjust
C．burdensome
D．infamous
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