单项选择题

In the first decades of the twentieth century, the individual gene 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
No other newspaper columnist has managed as yet to of readership.
A．though
B．in spite of this
C．even
D．so far
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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