单项选择题

A．He is using his computer for work purposes.
B．He often plays games on his computer.
C．His computer makes his life easier.
D．His client cannot use a computer.
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单项选择题
Which of the following best describes the passage as a whole
A．The Origin of Species is a very significant book.
B．Darwin’s discoveries were proved to be right though the Origin of Species was severely attacked.
C．The evolution of men has gone through a very long process.
D．It was impossible for Darwin to prove his ideas only with the aid of fossils.
单项选择题
It can be inferred from the passage that the most dangerous by-product of uranium mining and milling is ______.
A．solid mining wastes
B．the slurry in which the waste is stored
C．the radon gas that is emitted by the waste
D．the uranium that is recovered in the mining operations
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