第十五篇：(Unit 5,Passage 2) Racket, din clamor, noise, whatever you want to call it, unwanted sound is Americas most widespread nuisance. But noise is more than just a nuisance. It constitutes a real and present da...

第十四篇：(Unit 5,Passage 1) A controversy erupted in the scientific community in early 1998 over the use of DNA (deoxyribonucleic acid ) fingerprinting in criminal investigations. DNA fingerprinting was introduced...

第13篇 The case for college has been accepted without question for more than a generation. All high school graduates ought to go, says conventional wisdom and statistical evidence, because college will help them earn m...

Passage two (Vicious and Dangerous Sports Should be Banned by Law) When you think of the tremendous technological progress we have made, its amazing how little we have developed in other respects. We may speak contemptuo...

第11篇(Unit Four,Passage 2) Which is safer-staying at home, traveling to work on public transport, or working in the office? Surprisingly, each of these carries the same risk, which is very low. However, what about fly...

第10篇(Unit4 Passage1) Most of us are taught to pay attention to what is saidthe words. Words do provide us with some information, but meanings are derived from so many other sources that it would hinder our effectiven...

第9篇(Unit 3 Passage 4) We can begin our discussion of population as global issue with what most persons mean when they discuss the population problem: too many people on earth and a too rapid increase in the number ad...

第8篇(Unit 3 Passage 3) Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the time; if corrected too much, he will stop talking. He notices a thousand times a da...

第七篇(Unit 2 Passage 3) The discovery of the Antarctic not only proved one of the most interesting of all geographical adventures, but created what might be called the heroic age of Antarctic exploration. By their tr...

第六篇(Unit 2 Passage 2) Without regular supplies of some hormones our capacity to behave would be seriously impaired; without others we would soon die. Tiny amounts of some hormones can modify moods and actions, our...