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

<上一题目录下一题>

热门试题

单项选择题

According to the passage, the corpuscular theory of light ______.

A．was never accepted by the Royal Society
B．was finally accepted by Hooke and Huygens
C．was the most popular during the eighteenth century
D．was rejected by Hooke and Huygens but accepted for the next hundred yeas

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