【正文】 uttle Challenger blowing up in January 1986—killing all seven crew.4) When the teacher threatened to keep the pupils in after school they were quieted at once.5) Energy difficulties are a major barrier to the country39。s violent crimes.5. His poor health is not unrelated to his unhealthy way of life.Comprehensive ExercisesI. Cloze1.1. Statistics 2. rural3. era 4. stood for5. on the latch 6. vulnerable7. barriers 8. electronic 9. reflection 2.1. tougher 2. liable3. shift 4. electric5. cautious 6. sophisticated7. thieves 8. break9. chances 10. signsII. Translation).The Internet is changing the way people live, no matter whether they are in urban or rural areas.2).Mediumsized and small panies are more vulnerable to the threat of the global economic crisis than large ones.3).With regard to our term papers, the professor asked us to analyze the chart of unemployment first, and then provide critical reflections on the nation’s economic development.4).It never occurred to him that their team would win the basketball match by a large margin.5).Looking back on my twenty years’ teaching in high school, I attributed my success to patience, talent, and the constant pursuit of knowledge. is almost impossible to keep a determined burglar out. All you can do is discourage him for a few minutes, thus exposing him to police patrols or those wandering around. Common sense tells us that lighting is a barrier to criminal activity. A light should be fixed in the doorway and switched on at night. Make sure/assure yourself that you don’t leave the door on the latch if you happen to be the last to e in. If you decide to buy a sophiticated electronic alarm system, be sure to ask for its signs and put them up on both windows and doors. In addition you may have it hooked up to a police station.Unit 4 Was Einstein a Space Alien?Text AContent Questions （）1. He worked as a “Technical Expert, Third Class”. He needed the job to support his young family.2. He published five of the most important papers in the history of science. This is because they proved that atoms and molecules existed, laid the foundation for quantum mechanics, describe the theory of special relativity, and advanced the famous equation: E=mc23. He developed the Theory of Universal Gravitation then.4. Because his ideas were far ahead of other scientists of his time.5. He meant that like other scientists Einstein was a man of his time. If he hadn’t been born, his 1905 papers would eventually have been written in some form by others.6. What was remarkable about 1905 is that year a single person authored five of the most improtant papers in science. Einstein proposed in 1905 that light is particulate and for this he won the Nobel Prize in 1921.7. Because if you did so you would find yourself disagreeing with phisicist James Clerk Maxwell, an Authority Figure who had proved that light was an electomagnetic wave.8. He was not at all concerned about authority. He hated being told what was true.9. Science was dinnertable conversation in the Einstein household when he was young. His interest in science came naturally.10. He credited his discoveries to imagination and endless questioning more so that otthodox intelligence.11. He struggled to produce a unified field theory, binging gravity with other forces of nature, but he failed.12. He found Einstein’s brain looked much like any other. Text Organization （）1. ()Parts Paragraphs Main IdeasPart One Paras. 13 A young husband and father, Albert Einstein had to work hard to support his family. Part Two Paras. 412 Einstein made astonishing achievements in physics and thus revolutionized the field.Part Three Paras. 1321 Einstein’s discoveries were attributable to his imagination, questioning, disregard for authority, powers of concentration, and interest in science.Part Four Paras. 2223 Einstein was not space alien.2. ()1). He felt all the pressure and responsibility of any young husband and father.2). Galison: If Einstein hadn’t been born, his 1905 papers would have been written in some form by others.3). Other physicists like Max Planck, more senior and experienced than Einstein, were closing in on the answer, but he got there first.4). Einstein himself credited his discoveries to imagination and questioning more so than orthodox intelligence.5). He failed in producing a unified field theory.6). His brain looked much like any other.Language Sense Enhancement ()I. 1) concentration 2) lie down3) balance 4) engross himself in5) stimulated 6) more so 7) curious 8) assessment9) credited 10) intelligenceLanguage Focus ()Vocabulary1. (P. 104)1) accordingly 2) loose3) concentration 4) stimulating5) fabric 6) if anything7) reality 8) intuition 9) trifle 10) at the turn of the century 11) mess 12) undermine 2. (P. 105)1) approve of 2) slow down 3) take in 4) sucked into 5) set … apart 6) dozed off7) call forth 8) stretch into9) keep up with 10) believe3. (P. 105—106)1) The beautiful Malvern Hills have provided inspiration for many artistis and musicians over the decades. 2) Much of his success is credited to his power of imagination. 3) The industrial revolution was firmly built on the foundations of an agricultural revolution. 4) Alexander was determined not to make any plaints in the presence of the nurse. 5) September 1939 saw the outbreak of the Second World War.4. (P. 106)1) At school Einstein thought about questions which his teachers did not ask. They considered his con