单项选择题

When a person notices an emergency, he must （） before he acts to help.

A．feel himself responsible
B．call the police
C．hear a cry for help
D．be with a group

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单项选择题
Why didn't the thirty-two people act to help Kitty according to the passage（）

A．Because they were afraid to be killed.
B．Because they were cruel in their hearts.
C．Because they thought others would help.
D．Because they didn't notice the emergency,
单项选择题
The result of the tests shows that（）

A．the more people there are together, the more people will act to help
B．college students would be more likely to help than ordinary Americans
C．the more people there are together, the fewer people will act to help
D．none of the tested students acted to help
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