【单选题】
1054、说化氢在空气中的最高容许浓度是___mg/rm。
A. 10
B. 8
C. 6
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答案
A
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
Q3: Why is it considered bad luck to see a black cat crossing one’s path?___
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【单选题】
Q4: According to the passage, what will bring people good luck?___
A. Breaking a mirror on purpose .
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【单选题】
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A. 4 hours .
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【单选题】
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【单选题】
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【单选题】
Q4: How will the new high-speed train affect the man?___
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【单选题】
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【单选题】
Q2: What is the present situation about Americans’ commuting to work?___
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【单选题】
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【单选题】
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【单选题】
Q2: What is the actual reason that Katy doesn’t want to attend Jason’s party?___
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【单选题】
Q3: What is special about Linda’s party?___
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【单选题】
Q4: What will Katy do to solve her problem?___
A. Go to Jason's party .
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【单选题】
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【单选题】
Q2: Why did some stores open at midnight on Thanksgiving night?___
A. To attract young customers .
B. To beat other stores for sale.
C. To let people sleep late the next day .
D. To keep people stay up for the night .
【单选题】
Q3: How many Black Friday shoppers were reported to go to the shops at midnight this year?___
A. 24 percent .
B. 37 percent .
C. 9.5 percent .
D. 23.5 percent .
【单选题】
Q4: What can we learn about the 15-year-old Jenny?___
A. She and her cousins went back home at midnight .
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【单选题】
Q1: Why did the woman decide to do a triathlon?___
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【单选题】
Q2: When did the man first do a triathlon?___
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D. In high school .
【单选题】
Q3: How does the man feel about running?___
A. Boring.
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C. Exciting .
D. Interesting .
【单选题】
Q4: Why doesn’t the woman like swimming in the triathlon?___
A. Because she fears that a big fish might eat her .
B. Because she fears that she would get lost in lakes .
C. Because she doesn't want to scare away small fishes .
D. Because she doesn't like swimming with many people .
