18．A.how

　　B．why

　　C．when

　　D．what

　　句意：我本应通过表达我的行动如何影响到妻子开始我们的谈话。故选A其他选项不符合语境。A

　　19．A.compared

　　B．reported

　　C．finished

　　D．saved

　　句意：我应该先向她道歉说明我的行动影响到了她事后再向她解释我迟到的原因甚至永远都不要解释。选save在此指“免去避免”。D

　　20．A.showing

　　B．satisfying

　　C．understanding

　　D．destroying

　　本句表示能够理解对方的想法了。understanding是本文的关键词。C

　　七选五

　　Too much eating.Too many unhealthy foods.Too many advertisements for food.Too few activities.Different explanations are offered for America's weight problem － a problem increasingly shared by others countries.21.________

　　Schools have been urged to increase physical education, an important tool for public health.And many schools have done so.Yet now comes a study showing an increase in the number of injuries in P．E.class.Injuries increased by 150% between 1997 and 2007.

　　The study involved injuries treated in hospital emergency departments.Only 2% were serious.The researchers did not try to identify the causes of the increase, but they have some theories.Lara McKenzie from Ohio State University is the lead researcher.22.____________．For example, a 2004 study showed that the number of school nurses nationally failed to meet federal guidelines.Schools without a nurse on duty may be more likely to send an injured child to a hospital.

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