1、Unit 1Section Welcome to the unit & Reading课时作业（原卷+答案）.阅读理解AThe endangered pandas in the Qinling Mountains might face a new threat (威胁): the loss of their food, bamboo, which makes up 99% of their meals.Adult pandas spend most of the time eating bamboo and have to take in at least 40 pounds a day to
2、 stay healthy. However, a new study warned that they might soon find their food gone because most of the bamboo in the Qinling Mountains might disappear by the end of the century as a result of the rising temperature.A team made up of researchers has studied the effects of climate change on the bamb
3、oo in the Qinling Mountains. They have found that bamboo is very sensitive to climate change. “80% to 100% of the bamboo will be gone if the average temperature increases by 3.5 degrees Centigrade worldwide by the end of the century，” said Liu Jianguo, one of the reports authors. He added, “This is
4、how much the temperature will rise by 2100 even if all countries keep their promises in the ParisAgreement. But you know what is happening around the world.”In recent years, China has been trying its best to protect the endangered pandas by setting up more and bigger nature reserves (保护区)“But it is
5、far from enough and the endangered pandas need cooperation from the rest of the world, because their future is not just in the hands of the Chinese，” said Shirley Martin from World Wildlife Fund but not a member of the team.The Qinling Mountains are home to about 345 pandas. That is about 18% of the
6、 Chinas wild panda population. In addition, about 375 are living in research centers and zoos in China.1What can we learn from the first paragraph?ALots of the bamboo in the Qinling Mountains will probably disappear.BThe Qinling Mountains cannot provide enough bamboo for the pandas.CPandas in the Qi
7、nling Mountains are just threatened with the loss of food.DPandas have already eaten 99% of the bamboo in the Qinling Mountains.2What did Liu Jianguo mean?AChina needs more help from World Wildlife Fund.BThe current climate is not suitable for bamboo any more.CChina is making great efforts to protec
8、t the pandas.DIt is difficult to prevent the temperature from rising by 3.5 .3How many wild pandas are there in China?AAbout 345. BAbout 720.CAbout 1，900. DAbout 2，275.4. Which can be the best title for the text?AThe Disappearance of BambooBNecessity of Changing Pandas FoodCEfforts Made to Save Pand
9、asDA New Threat Faced by PandasB A study has found that a lifetime of regular exercise and activity can slow down the aging process (衰老过程). Researchers say that getting older should not necessarily mean becoming weaker or sicker. Their research shows that the devotion to a life of movement and exerc
10、ise may help us live not only longer, but also more healthily.For their study, the researchers studied two groups. The first group was made up of 125 nonprofessional cyclists between the ages of 55 and 79. This group included 84 healthy men and 41 healthy women. This group was called the “cyclists”R
11、esearchers then found 130 people to make up the second group. Within this group, 75 people were aged from 57 to 80. The other 55 were between the ages of 20 and 36. The people in this group were also healthy, but they did not exercise regularly. This group was called the “nonexercisers”. Smokers, he
12、avy drinkers of alcohol and people with other health issues were not included in the study.Then, researchers gave both groups a series of tests. They tested their muscle mass (肌肉质量), muscular strength, percentage of body fat and the strength of their immune systems (免疫系统). Then the researchers compa
13、red the results of the two groups.Results showed that the cyclists did not experience body changes usually regarded as a normal aging process. For example, they did not lose muscle mass or muscular strength. Also, their body fat did not increase with age.The researchers also found something they had
14、 not expected. The study showed that the immune systems of the cyclists did not age either.The researchers advise us all to find the exercise that we like in our lives.5How did the researchers carry out the study?ABy comparison. BThrough discussion.CBy imagination. DBy reasoning.6Which of the follow
15、ing is a result of the research?AThe cyclists kept thin.BThe nonexercisers gained weight easily.CThe cyclists muscles remained strong with age.DThe nonexercisers usually had health problems.7Which is an unexpected result for the researchers?AThe cyclists had the normal aging process.B.The cyclists i
16、mmune systems didnt age.CThe cyclists lost nearly all their fat.DEveryone needed exercise in their lives.8Which of the following can be the best title for the text?AHealthy People Need More ExerciseBTake Exercise: the Harder, the BetterCCycling Is the Best Way to Prevent AgingDA Lifetime of Exercise
17、 Slows the Aging Process.完形填空As our Earths temperature warms up because of climate change, it is having unexpected effects on our worlds forests. When temperatures rise, trees close their skins to _1_ the loss of water, and this, in turn, slows down the _2_ of photosynthesis (光合作用). As a result, the
18、se trees are shorter and grow slowly, as well as have a _3_ death rate.Climate change also increases the _4_ of droughts and wildfires. After wildfires, it takes a while for the forest systems to _5_， and in some cases, the forests are _6_ permanently. Trees that are stressed are also _7_ to attacks
19、 by bacteria (细菌). In tropical forests, vines that use the trees as _8_ can often choke the trees and rob them of nutrients. Finally, humans have _9_ the forest landscape through logging. When trees are replanted on the soil, they will never grow as large as the _10_ trees that were cut down.As thes
20、e forests disappear, species that once called them “home” are forced to change, _11_ the variety of those systems. _12_， some endangered species are unable to _13_ and die. Oldgrowth forests are disappearing in all regions of our world. When forests die, younger forests that are reestablished in the
21、 same area grow back weaker and smaller _14_ poor vegetation (植被). With trees dying increasingly and continuously, will future generations _15_ out on the wonders of forests?1A.protect BpreventCsave Dfree2A.movement BsituationCprocess Doperation3A.higher BfirmerClighter Dsmaller4A.choice BmeasureCqu
22、alification Dchance5A.grow BrescueCrecover Ddecline6A.ignored BlostChurt Dleft7A.accessible BenjoyableCacceptable Dfavorable8A.attention BcommandCtrust Dsupport9A.frightened BpaidCruined Dwasted10A.common BoriginalCdistant Dstrong11A.affecting BimprovingCforgetting Dreflecting12A.Besides BSurprising
23、lyCOtherwise DUnfortunately13A.devote BkeepCadapt Dlead14A.due to Bin addition toCinstead of Din spite of15A.pass BmissCbreak Dbring参考答案.阅读理解A【语篇解读】本文是一篇说明文。主要讲述了生活在秦岭的大熊猫可能将面临一个新的威胁：其赖以生存的竹子可能会因为气温升高而消失。1答案与解析：A考查细节理解。根据第一段的内容可知，秦岭地区大熊猫赖以生存的竹子可能会大量消失。故选A。2答案与解析：D考查推理判断。根据第三段中他所说的话可知，他认为即使所有国家都严格遵守其
24、在巴黎协定中的承诺，到2100年全球气温仍将上升3.5摄氏度。故选D。3答案与解析：C考查简单计算。根据最后一段中的“The Qinling Mountains are home to about 345 pandas. That is about 18% of the Chinas wild panda population”可得出，中国野生大熊猫总数约为1900只。故选C。4答案与解析：D考查主旨大意。文章开篇点明主题，秦岭地区的大熊猫可能面临新的威胁其赖以生存的竹子可能消失。故D项最符合题意。B【语篇解读】本文是一篇说明文。主要讲述了一项研究发现终身规律锻炼可减缓衰老过程。5答案与解析：
25、A考查推理判断。根据第二段至第六段可知，研究人员设立了两个对比小组并比较了两组的结果，即研究人员通过比较来进行研究。故A选项正确。6答案与解析：C考查细节理解。根据第五段中的“Results showed that the cyclists did not experience body changes.they did not lose muscle mass or muscular strength”可知，研究结果显示，骑自行车的人没有随着年龄的增长而失去肌肉质量和肌肉力量，也就是说骑自行车的人的肌肉依然保持强健。故C选项正确。7答案与解析：B考查细节理解。根据倒数第二段可知，令研究人员没
26、有想到的是，骑自行车的人的免疫系统也没有老化。故B选项正确。8答案与解析：D考查主旨大意。根据第一段第一句“A study has found that a lifetime of regular exercise and activity can slow down the aging process (衰老过程)”以及下文内容可知，本文主要说的是一项研究发现终身有规律地运动可以减缓衰老过程。故D选项最适合作为本文标题。.完形填空【语篇解读】本文是一篇说明文，文章讲述了地球变暖对世界上森林资源带来的一系列变化：树木的死亡率升高，干旱和野火发生的概率升高，森林的消亡，还有物种的灭绝。1答案与解
27、析：B当温度上升时，树木就会把它们的皮闭合起来以防止温度升高带来的水分的流失，转而又减缓了光合作用的进程。故选B。2答案与解析：C减缓的是光合作用的进程。process过程，进程，符合此处的语境。故选C。3答案与解析：A这些树长得更矮，生长缓慢，死亡率更高。故选A。4答案与解析：D根据本段的内容，主要讲述野火发生后，森林系统的变化，可知温度变化也会增加干旱和野火发生的概率。the chance of的概率，的可能性，故选D。5答案与解析：C野火发生后森林系统需要一段时间才能恢复。recover恢复。故选C。6答案与解析：B野火发生后森林系统需要一段时间才能恢复，甚至有一些森林永久地消失了。故选
28、B。7答案与解析：A在野火中受到影响的树也容易受到细菌的攻击。be accessible to容易接近的，容易进入的。故选A。8答案与解析：D在热带森林中，以树木为支撑物的藤本植物，经常会使树木窒息还会掠夺树木的营养。故选D。9答案与解析：C最后，人类通过伐木也毁掉了森林景观。故选C。10答案与解析：B当在土壤上重新种植树木时，它们永远不会长得像原来被砍倒的树那么大。original原本的。故选B。11答案与解析：A随着这些森林的消失，曾经称之为“家园”的物种被迫改变，这影响了系统的多样性。故选A。12答案与解析：D根据上文内容，森林系统发生了改变，可知一些濒危的物种不能适应，因此灭绝，这是很不幸的。故选D。13答案与解析：Cand连接的词在词性和词义上保持一致。由后面的die“死亡”可知此处应选adapt“适应”。故选C。14答案与解析：A当森林消失了，在同一地区重新建立的森林会由于植被不良而变得更弱、更小。due to由于。故选A。15答案与解析：B作者在思索：随着树木不断地消失，我们的子孙后代是否会失去森林的奇迹？miss out on错过机会；错失。故选B。
