Why did New Yorkers become more caring after 9/11?
A. They didn’t want to be hated by more people.
B. They were afraid of more attacks from terrorists.
C. They attached more value to life.
D. They realized the shortage of people.
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One explanation for the good manners of Swiss shop workers is that _______.
A. they have been educated to do so
B. they understand that the more polite they are, the more customers they will get
C. they can get a bonus for treating customers well
D. they are proud of the service they provide
Which city or cities ranked the fourth?
A. Berlin.
B. Zagreb.
C. Sao Paulo.
D. All of the above.
What impressed the researchers about the petty criminals in Sao Paulo?
A. They were very polite and friendly to the police.
B. They were not afraid of the police while doing business at the illegal market.
C. They said thanks to customers before fleeing upon the police’s arrival.
D. They sold good-quality sunglasses.
曲轴的常见损伤形式有（ ）。
A. 磨损（轴向磨损和径向磨损）
B. 变形（弯曲、扭曲）
C. 裂纹
D. 断裂
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