噪声对人体的危害有三个构成要素，即()。A.噪声源 B.传播途径 _爱下问搜题

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问题多项选择题

噪声对人体的危害有三个构成要素，即()。

A.噪声源

B.传播途径

C.接受者

D.声在真空中的传播

E.声音的合成

答案

参考答案：A, B, C

写句子

补充内容，使句子内容完整。

1．__________像______________。

2．虽然__________，但是___________________。

补全对话，情景问答

补全对话：从方框中选择最佳选项完成对话。

A. There are eighteen boys in our class.
B. Is there a computer on your desk?
C. Are there twenty boys in your class?
D. How many students are there in your class?
E. Are there any libraries in your school?

Jane: Hello, Daming.  1
Daming: Hello, Jane. There are forty students in our class.
Jane:   2
Daming: No, there aren't.  3
Jane:   4
Daming: Yes, there are.
Jane:   5
Daming: No, there isn't. But there is one on our teacher's desk.
Jane: Thank you.
Daming: You're welcome.