单项选择题


Questions 17-20 are based on the following passage. You now have 20 seconds to read Questions 17-20.
How many students did he teach there

A．Nineteen.
B．Sixty-five.
C．Eighty-four.
D．Fifty.
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Security exchanges handle ______.
A．securities
B．grain
C．bonds
D．both A and C
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What is the real reason that makes her ill
A．She uses too many sleeping pills.
B．She is too thin.
C．She is sensitive to foods and chemicals.
D．It is not known.
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