单项选择题

The term "Out of thin air" in Line 3 of Paragraph 2 can be best replaced by ______.

A．convincingly
B．confidently
C．groundlessly
D．suitably
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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
单项选择题
What is the author's attitude towards assumptions based on statistical evidence
A．positive
B．objective
C．doubtful
D．optimistic
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