What does the speaker mainly talking about?
A、
Pollution.
B、
Human voice.
C、
Good old days.
D、
None of the above.
【正确答案】
A
【答案解析】
单选题
What does the saying "you can't hear yourself think" mean?
A、
You have head trouble.
B、
You are too stressed.
C、
It' s very noisy.
D、
There is something wrong with your ears.
【正确答案】
C
【答案解析】
单选题
How many ways of reducing harm are mentioned?
A、
Five.
B、
Four.
C、
Three.
D、
Two.
【正确答案】
D
【答案解析】
单选题
What is the main purpose of the speech?
A、
To explain scientific knowledge.
B、
To explain this phenomenon.
C、
To call on people to act.
D、
To introduce a saying.
【正确答案】
C
【答案解析】
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