题目内容

__________________________?

A. She is working for her brother.
B. She is helping her brother look for a job.
C. She is looking after her brother.
D. She will go with her brother to find a job.

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_____________________________?

A. The man is asking for an opinion.
B. The woman is introducing herself.
C. The woman is offering the man help.
D. The woman can't help the man.

Directions: In this section you will hear a recorded short passage. The passage is printed on the test paper, but with some words or phrases missing. The passage will be read three times.By the ___ (1)evening, there was much for my wife to report. The bonus _(2)had worked until someone demanded to see the color of cash. Then some activists on the work force claimed that the workers had no _(3)settling for $ 5 and a few competitive bonuses while the bosses collected hundreds of dollars each. The organizer had _(4)that all the workers were entitled to $ 5 per hour. They would not work another ____(5)until the bosses agreed.

噪声的危害有哪些？

A. 对人体的损害
B. 对动物产生影响
C. 对建筑物有一定的损害
D. 会影响儿童和胎儿

常用的消声器有哪些？（）

A. 阻性消声器
B. 抗性消声器
C. 阻抗复合式消声器
D. 多孔扩散消声器