单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

[A] The effect of the atmosphere on rainfall. [C] How water originated on earth.
[B] How conditions on earth support life. [D] A new estimate of the age of earth.
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单项选择题
[A] In the student recreation center. C. In the university bookstore.B. In the campus dining hall. D. In a classroom.
[A] In the student recreation center.
C. In the university bookstore.
B. In the campus dining hall.
D. In a classroom.
单项选择题
A．The class thought the demonstration was too complex.B．Too many students showed up.C．The professor didn’t show up.D．The professor cancelled it.
A．The class thought the demonstration was too complex.
B．Too many students showed up.
C．The professor didn’t show up.
D．The professor cancelled it.
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