题目内容

At the end of the 7 weeks, the step-test was again given to both groups of subjects, and their pulses taken. The post-exercise pulse rates of subjects in the experimental group were found to have decreased an average of 30 heart beats per minute, with the lowest decrease 28 and the highest decrease 46. The pulse rates of subjects in the control group remained the same or changed no more than 4 beats, with an average difference between the initial and final tests of zero.
Tile step-test was given ______.

A. after each exercise period
B. at the beginning and at the end of the seven week period
C. only once, at the beginning of the seven week period
D. twice to the men in Group A and once to the men in Group B

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A. after each exercise period B. at the beginning and at the end of the seven week period C. only once, at the beginning of the seven week period D. twice to the men in Group A and once to the men in Group B

A．They make him feel good.B．They bore him.C．They make no impact on him.D．They make him

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A．They complete all their assignments.B．They study hard for his tests.C．They compete f

A. after each exercise period
B. at the beginning and at the end of the seven week period
C. only once, at the beginning of the seven week period
D. twice to the men in Group A and once to the men in Group B

听力原文：W: Those trees next to your house am beautiful.
M: Yeah, and they're useful too. They cut down on the need/or air-conditioning,
Q: What does the msn mean？
(16)