单项选择题


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

A．He is going to sign a contract.
B．He is signing his check to buy something.
C．He wants to skim through the piece.
D．He wants to register his name to enroll a course.
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单项选择题
Which of the following is used by modern scientists to indicate a coming earthquake
A．The crying of dogs.
B．The conductivity of rocks.
C．The changes in the water table.
D．The quantity of fluid in earth.
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