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

Which of the following is an emergency（）

A．Someone is falling onto the ground.
B．Someone is having a heart attack.
C．Someone is having a trouble.
D．Someone is sleeping off a drunk.

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,