单项选择题

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

A) One dollar. C) One dollar and 5 cents.
B) 75 cents. D) 80 cents.
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单项选择题
When were pulse rates taken
A．after every exercise period
B．every day
C．after the step-tests
D．every time the ratio of active riding was increased
填空题
E
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