单项选择题

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

A．Delivery service manager and driver.
B．Teacher and student.
C．Lawyer and client.
D．Doctor and patient.
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单项选择题
What is NOT the cause for the imminent water war
A．Lack of water resources.
B．Lack of rainfall.
C．Inefficient use of water.
D．Water has replaced oil.
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