题目内容

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

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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

[A] regarding
[B] reflecting
[C] revealing
[D] representing

4l.
[A]in
[B]at
[C]by
[D]on