Vocabulary DevelopmentScan the f

Vocabulary DevelopmentScan the following passage and find the words or phrases that have roughly the same meaning as those given.Walking produces some other interesting psychological effects, according to studies currently under way by various graduate students and myself. One especially important benefit may be for cigarette smokers who are trying to cut down or quit. Since people often smoke to increase their energy or reduce tension, we have asked smokers to take five-minute walks before they light up. So far the results are very impressive. Following a walk,our smokers wait twice as long as non walking smokers do between cigarettes during free-smoking periods. And those who report the greatest energy increase from the walk wait the longest to smoke the next cigarette.10. a length of time______
【正确答案】：period
【题目解析】：P78