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1、Unit 1 A land of diversity 阅读理解A(2018河南洛阳高三第一次统考)All over the world mothers and fathers teach their children manners.Other children may have manners that are not like yours.There are all kinds of manners.Many years ago，children who had good manners were seen and not heard.They kept quite quiet if gr
2、ownups were talking. Today, wellmannered children have more freedom.Sometimes good manners in one place are bad manners in other places. Suppose you are a visitor in the land of Mongolia. Some friends ask you to eat with them. What kind of manners do they want you to have? They want you to give a lo
3、ud “burp(打嗝)” after you finish eating. Burping would show that you like your food. In some countries, if you give a loud burp, you are told to say “Excuse me, please.” In many places people like to eat together. But in some parts of Polynesia it is bad manners to be seen eating at all. People show g
4、ood manners by turning their backs on others while they eat. What are manners like in an East African town? The people try not to see you. They are being polite. You may see a friend. He may not see you at all. If you are polite, you will sit down beside him. You will wait until he finishes what he
5、is doing.Then he will talk to you.Suppose you visit a friend in Arabia.You should walk behind the other tents until you come to his tent.If you pass in front of the other tents，you will be asked into each one.The people will ask you to eat with them.And it is bad manners if you say no.Manners are di
6、fferent all over the world.But it is good to know that all manners begin in the same way.People need ways to show that they want to be friends.【解题导语】本文主要介绍了世界上一些地方的礼仪。1How did polite children behave in the past?ABy looking into adults eyes while talking.BBy keeping silent while adults were talking.
7、CBy slipping into the house without being heard. DBy not opening their mouths until spoken to. B解析：细节理解题。根据第二段的第二句可知，过去，在大人们说话时，儿童保持沉默是一种礼貌的行为。 2Which custom should we follow in order to look wellmannered? ASaying “Excuse me” on burping in Mongolia. BInviting guests to dinner together in Polynesia.C
8、Talking with a friend before he completes things in East Africa. DAccepting an eating invitation in Arabia. D解析：细节理解题。根据第三段的最后两句可知，接受阿拉伯人一起吃饭的邀请是礼貌的行为。3What can we infer from the text? AHear much，speak little. BLove me，love my dog. CWhen in Rome do as the Romans do. DDo what you ought to. C解析：推理判断题。
9、根据全文内容尤其是最后一段的第一句可推知，礼仪因地域而各有不同，因此最好的做法是入乡随俗。BVitamin B could help lessen the effects of the most dangerous type of air pollution, according to a new study published recently. In the first study of its kind, a team of international researchers looked at the damage caused by one of the pollutants tha
10、t have the most severe impact on health: PM2.5.Particulate matter, or PM, is a type of air pollutant consisting of small particles of different sizes. PM2.5 has a diameter of fewer than 2.5 micrometers, about 30 times smaller than a human hair. These particles are so small that they can go into our
11、respiratory system(呼吸系统), resulting in lung and systemic inflammation(炎症) and stress.The team found that something as simple as a daily vitamin B supplement could potentially reduce the impact of the tiny particles on the human body, although they stressed that the research was in its early stages a
12、nd the sample size was small.For this study, 10 volunteers were initially exposed to clean air and given a placebo(安慰剂) to check their responses. The group then took another placebo for four weeks before being exposed to heavily polluted air from downtown Toronto, where an estimated 1，000 cars pass
13、every hour. The bad air was delivered to the volunteers through an “oxygentype” face mask. The experiment was then repeated, with each volunteer taking a B vitamin supplement daily made up of 2.5 mg of folic acid, 50 mg of vitamin B6, and 1 mg of vitamin B12. B6 can be found in liver, chicken and nu
14、ts, and B12 in fish, meat, eggs, milk and some cereals.The researchers found that four weeks of B vitamin supplements reduced the damage of PM2.5 exposure by 28%76%. The results highlight how prevention at an individual level could be used to fight the harmful effects of PM2.5.【解题导语】本文是一篇说明文。吸入人体内的P
15、M2.5(细颗粒物)会导致疾病。不过，研究发现维生素B在一定程度上能降低PM2.5的危害。4Why is PM2.5 harmful to our health?AIt pollutes and poisons the air.BIt is too much to be got rid of.CIt carries viruses and diseases.DIt is easily breathed in and damages our body.D解析：细节理解题。根据第二段中的“These particles are so small.inflammation(炎症)and stress
16、.”可知，PM2.5(细颗粒物)很小，能进入我们的呼吸系统，导致肺部和全身炎症。5What can we infer from Paragraph 3?AThe process of the research was not scientific.BThis kind of research has been done many times.CFurther studies are needed to confirm their findings.DVitamin B is hard to obtain in peoples daily life.C解析：推理判断题。根据第三段中的“although they stressed that the res
