单项选择题

The word "proper" in the first line of the second paragraph means______.

A．small
B．big
C．right
D．wrong
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单项选择题
It can be concluded that the passage is most probably part of a(n)______.
A．horror story
B．news report
C．research paper
D．article of popular science
单项选择题
In writing the passage, the author intends to______.
A．give an accurate description of the possible disaster in the future
B．prove that humans will sooner or later be destroyed
C．tell the historical development of the Earth
D．warn of a possible disaster in the future
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