单项选择题

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

A．Doctor and patient.
B．Student and teacher.
C．Sales assistant and customer.
D．Manager and office clerk.
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单项选择题
Which statement is TRUE according to the passage
A．The Thames has not been saved from pollution yet.
B．The condition of the Thames was at worst in the 1950s.
C．Few people are concerned about the pollution problems of the Thames.
D．No one is certain what the main cause for the pollution of the Thames is.
单项选择题
A．enhanceB．createC．makeD．produce
A．enhance
B．create
C．make
D．produce
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