题目内容

[A] at
[B] for
[C] over
[ D] on

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[ A] worrying
[ B] doubting
[ C] caring
[ D] boasting

[A] commercial
[B] traditional
[C] genuine
[D] lively

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.

[A] energy
[B] money
[C] time
[D] effort