单选题
英语六级
2016-11-06
Questions 20 to 22 are based on the recording you have just heard.
A．To remind students of information from a previous lecture.
B．To point out a feature common to all desert plants.
C．To reinforce a point about drought-tolerant plants.
D．To help students understand the concept of adaptation.
参考答案
C
答案解析
暂无解析
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