Walking produces some interesting psychological effects, according to studies currently under way by researchers
at California State University. One especially important 13 may be for cigarette smokers who are trying to cut
down or quit. 14 people often smoke to increase their energy or reduce tension, researchers have asked smokers to
take five-minute walks before they light up. So far the results are very impressive. Following a walk, smokers wait
15 than non-walking smokers do between cigarettes during free-smoking periods. And those who report the greatest
energy increases from the walk wait the longest to smoke the next cigarette 【題組】15 (A) two longer times (B) two times longer (C) twice as long (D) a long time
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