题目内容：
第（32）题选
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答案解析：
单选题：第（32）题选
- 题目分类：英语(二)
- 题目类型：单选题
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Cloud lightning looks like a ribbon when its lighting channe
Cloud lightning looks like a ribbon when its lighting channel__________
The passage is mainly concerned with the_______.
The passage is mainly concerned with the_______.A．types and function of sleep B．
第（48）题选
第（48）题选
第（29）题选
第（29）题选
第（38）题选
第（38）题选