题目内容

At first, the narrator didn't smile back to the Bushman because _______________.

A. he was not happy because of his broken car.
B. he was full of prejudices he had carried with him from his own culture.
C. he was a serious man who never smile to strangers.
D. he haven't seen the Bushman behind the bushes.

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P148Lead-in[音频]Task 1. Listen to an adapted excerpt of Earth in the Balance by Al Gore. Which two factors have changed our relationship to the Earth in the 20th century according to the audio clip?

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