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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单项选择题

Which of the following is NOT TRUE according to the author's description of the disaster in 2094

A．The whole world becomes extremely cold.
B．All the coastal cities in Africa are destroyed.
C．The whole mankind becomes extinct.
D．The visit of the comet results in wars.

单项选择题

Why does the author mention dinosaurs at the end of the passage

A．Because they could only live in the warm climate.
B．Because they once dominated the earth.
C．Because their extinction indicates future disasters.
D．Because dinosaurs and humans never live in the same age.