单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．In a theater.
B．At a bank.
C．In a clinic.
D．In a plane.
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单项选择题
A．AIDS has spread all over the world.B．AIDS has killed numerous people.C．AIDS cannot be conquered.D．AIDS is serious in middle-aged people.
A．AIDS has spread all over the world.
B．AIDS has killed numerous people.
C．AIDS cannot be conquered.
D．AIDS is serious in middle-aged people.
单项选择题
A．The destruction process of ozone layer is slowing down.B．The ozone layer has been destroyed seriously.C．Ozone layer can protect us from strong radiation from the sun.D．Ozone is produced by waste gas.
A．The destruction process of ozone layer is slowing down.
B．The ozone layer has been destroyed seriously.
C．Ozone layer can protect us from strong radiation from the sun.
D．Ozone is produced by waste gas.
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