单项选择题

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

A．At 9:30.
B．At 10:30.
C．At 10:00
D．At 11:00
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单项选择题
People did not begin to use unmanned vehicles in undersea exploration until recently because of ______.
A．the ocean depths
B．the communication problem
C．the movement of waves
D．the problem of vacuum
单项选择题
To whom or what does the pronoun they in underline , Para. 5 refer
A．The original building sites.
B．The townspeople.
C．The burned-down houses and shops.
D．The landlords.
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