B．briefly

　　C．actually

　　D．occasionally

　　答案：A　根据常识可知，在学习上的技能主要是阅读和写作。chiefly“主要地”；briefly“简要地”；actually“事实上”；occasionally“偶尔”。

　　20．A.are paid

　　B．is paid

　　C．pays off

　　D．pay off

　　答案：D　如果你学会了更好地阅读和写作，那么会有极大的好处来回报你学习的各个方面。短语pay off“回报”，符合语境；再根据定语从句的引导词“that”指代的先行词“benefits”可知，应选D。

　　Ⅱ.阅读理解

　　A

　　[2015·山东济南一模]If you think that running marathons will help you live a long and healthy life， new research may come as a shock. According to a recent scientific study, people who do a very strenuous workout are as likely to die as people who do no exercise at all.

　　Scientists in Denmark have been studying over 1,000 joggers and non­joggers for 12 years. The death rates from the sample group indicate that people who jog at a moderate pace two or three times a week for less than two and a half hours in total are least likely to die. The best speed to jog at was found to be about 5 miles per hour. The research suggests that people who jog more than three times a week or at higher speeds of over 7 mph die at the same rate as non­joggers. The scientists think that this is because strenuous exercise causes structural changes to the heart and arteries (动脉). Over time, this can cause serious injuries.

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