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1、【课本习题】人教版 必修三 Unit 4作者：儒风无棣时间：2012年12月28日 00:01Unit4课内练习答案.(P27Ex.1.)1. Para.1: A widely accepted theory about the formation of the universePara.2: The formation of the earthPara.3: The importance of water for lifePara.4: The development of plants and animals on the earthPara.5: The arrival of human
2、s and their impact on the earth2.P27 Ex.2.10 7 3 8 4 9 6 1 5 2 12 113.P27 Ex.3.1. Because the water remained on the earth.2. Because plants provide oxygen for animals to breathe.3. Because dinosaurs died out long before human being developed on the earth.4. The name is Pluto. Scientists now think it
3、 is too small to be called a planet.5. Human beings caused global warming. 4.P27 Ex.4.Discourse markers:however, after that, next, later, finally, thus, as a result of thisSentence connectors or conjunctions:and, but, because5.P28 Ex.16.P28 Ex.21 C 2A 3C 4B7.P28 Ex.3fundamental, astronomy, gave birt
4、h to, existed, As a result, atoms, preventsfrom, puzzle8.P28 Ex.4Emotional words: violent, angry, rude, shocked, excited, crazyCalm words: patient, gentle, relaxing, kind, easy-going, calm9.P29 Ex.21. What has not yet been proved is his discovery.2. Whether the other astronomers accept his ideas rem
5、ains a question.3. How life first appeared on earth is still a mystery to scientists.4. Why the earth is becoming warmer is an important topic for research.5. It amazed everybody that Stephen Hawking at 65 experienced zero gravity during a flight.6. It is a surprise that Pluto is no longer considere
6、d a planet in our solar system.10.P29 Ex.31,4,3,5,2,611.P30 Ex.2Summary B is correct because it gives a clear idea of what the listening passage is about.Summary A is not true. The three scientists wanted to explain how the universe worked and how it began. Summary C is too general and does not give
7、 enough detail about what the listening passage is about.12.P30 Ex.313.Unit4Workbook 练习答案(P62 Ex.1)1. Several countries are involved in space travel with satellites and spaceships that have visited one of the planets (Mars: USA) and the moon (USA). Only one country has sent astronauts to the moon an
8、d returned them safelythe USA.2. Three countries have sent astronauts into space: Russia, USA and China.3. The Russian astronauts have travelled round the earth lived in a space station and landed on the moon.The Chinese astronauts have travelled round the earth and one has walked in space.14.P62 Ex
9、.2The main idea: The excitement of space travel and the qualifications and experience needed to become an astronaut.15.P62 Ex.316.P62 Ex.417.P62 Ex.5dreamed, young, wish, true, gradually, opportunity, love18.P63 s Ex.11. blocking out 2. broke out 3. gave out 4. sold out 5. watch out 6. hang out19.P6
10、3 Ex.21. religions, religious 2. like, unlike 3. gentle, gently 4. presentation, present 20.P63 Ex.31. Now that we have finished the design, the company, in its turn, will do the construction.2. The fire did not cause too much damage, because the firefighters arrived in time. 3. The spaceship was pu
11、lled close to the satellite by its strong gravity.4. The sandstorm led to a chain reaction which ended in a serious train crash.5. The atmosphere in the classroom relaxed after the teachers humorous talk cheered us up.6. Dont disturb her. She gave birth to a boy last night and now she is asleep.7. M
12、ost of the evidence was destroyed. Thus, its impossible to prove that the drug is harmful.8. Clouds are masses of very small drops of water that float in the sky.21.P63 Ex.4existed, lived, developed, protectfrom, climate, multiplied, weather, preventfrom22.P64 Ex.16,2,7,3,1,5,46 scientists belief7 His suggestion23.P64 Ex.2
