单项选择题

Questions 18～21 are based on the following conversation. How many dollars does the woman have to pay for the metal shelf

A．$ 12.50.
B．$15.50.
C．$ 3.
D．$15.
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单项选择题
The author thinks that crime is increasing in cities because ______.
A．criminals are difficult to trace in large populations
B．people do not communicate with their neighbors
C．people feel anonymous there
D．the trappings of success are attractive to criminals
单项选择题
What is the professor’s first reply to the woman’s request
A．He does not intend to offer the course.
B．He does not think the course will interest her.
C．He never accepts undergraduates in his course.
D．He thinks the course will be too difficult for her.
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