单项选择题

The word "evaporated" in Line 3 of Paragraph 1 is closest in meaning to ______.

A．disappeared
B．transformed
C．worsened
D．emerged
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单项选择题
Which of the following statements is true according to Peter Watson in this passage
A．There have been no innovations at all in the fifty years since 1950.
B．Most scientific research is only continuation of the previous studies since 1950.
C．The advanced technologies are only small things that have not changed the way we think.
D．We actually haven' t made any progress in the past 50 years because of fewer innovations.
单项选择题
According to the passage, what we can do about the likelihood of extraterrestrial life is to ______.
A．find a good way of reaching a conclusion
B．construct a good theory of the origin of life
C．replace statistics with empirical knowledge
D．find whether the conditions for life are right
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