单项选择题

We can learn from the passage that the tired land has fully recovered ______.

A．when grasses and other plants appear again
B．when the treatment is given by nature alone
C．after it has been lying idle for ten years
D．after grasses and other plants have decayed again
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单项选择题
It is implied that a modem farmer cannot simply move to another place when his field has become tired. This is because ______.
A．the production power of a new field is not higher than that of an old one
B．it takes a farmer more than ten years to cultivate a new field
C．the population of the world has increased rapidly
D．there will be too many grasses in a new field to grow crops
单项选择题
From this passage it seems that ______.
A．Newton was not a successful scientist until he published his works
B．Newton was a scientist with at least three theories
C．Newton's theory was not accepted because Hooke did not approve it
D．Newton did not publish his theories because he was too disappointed
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