3) Though I do well in my history and language classes, I feel quite stupid when it comes to math and science.

　　4) Although I do not earn a great deal of money for this job, the pleasure I receive from the work makes it worthwhile

　　5) Though the job is new to us, we are confident we’ll learn to do it in a couple of days

　　6) Although he had the opportunity to hunt and fish with great Indian outdoorsmen, he was denied opportunity in other ways

　16.表示因果或前提关系

　　1) Partly because of increased awareness, the incidence(发病率)of AIDS has dropped in many U.S. cities.

　　2) This is probably because of the way we are taught as children.

　　3) Because of excellent weather conditions and extremely strong signals, Venusian scientists were able to get valuable information as to the feasibility of a manned flying saucer landing on Earth.

　　4) Because of the pressure(压力)of examinations, many students are left with little or no free time.

　　5) How one presents himself at an interview will often decide whether or not he will be given a job.

　　6) Perhaps it’s because few of us know how to accept compliments(赞扬)gracefully

　　7) Because of this defensive reaction, direct compliments are surprisingly difficult to give.

　　8) That is why some of the most valued pats on the back are those which come to us indirectly, in a letter or passed on by a friend.

　　9) That is why housework is considered such a dreary grind(乏味的苦差事).

　　10) I don’t teach because teaching is easy for me. Nor do I teach because I think I know answers, or because I have knowledge I feel compelled (非得)to share.

　　11) I teach because I like the pace of the academic calendar; I teach because teaching is a profession built on change; I teach because I like the freedom to make my own mistakes.

　　12) I have left out the most important reasons why I teach.

　　13) The reason for this is that technology feeds on itself

　　14) Owing to fierce competition among the airlines, travel expenses have been lowered considerably.

　　15) Owing to the lack of coordination between the two sides, the project has made little progress so far.

　　16) The teacher tried to encourage her students to become less dependent on their parents because they would sooner or later have to take care of themselves.

　　17) Yet the public has every reason to be wary of professional deception(欺骗)

　　18) At times, they see important reasons to lie for the patient’s own sake.

　　17.表示存在的问题

　　1)One of the greatest problems facing the 21st century will be what to do with all the rubbish produced in the world.

　　2) The frequent use of drugs (毒品) is a serious problem among some American young people.

　　3) To travel abroad is a desire shared by many people, but few can afford to do it.

　　4) Man still has a lot to learn about the most powerful and complex part of his body-the brain.

　　5) We had a ling debate as to whether we should spend so much money on space technology.

　　6) Many people have the bad habit of spending money on impulse.

　　7) The custom of having one’s marriage arranged by parents has disappeared in many parts of the world but continues in some Asian and African countries.

　　8) Cheating is now considered to be a major problem in colleges and universities.

　　9) No agreement was reached as to how the plan should be carried out.

　　10) True, the cost of living has gone up, but so have the workers ‘wages.

　　11) I had trouble learning or doing something important to me.

　　12) She had a little trouble with her typing.

　　13) Many university s

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