四级模拟考试题目.docx

1、四级模拟考试题目大学英语四级考试模仿试题Part I Writing (30 minutes)Directions：For this part you are allowed 30 minutes to write an essay based on the outline below. You should write at least 120 words，and base your composition on the outline given below in Chinese. 当前社会上越来越多人开始在网上购买商品了，对此你有什么看法呢?1. 诸多人开始在网上购买商品2. 网上购物也

2、许存在问题3. 我看法The Quality of ProductsPart II Reading Comprehension (Skimming and Scanning) (15 minutes)Directions：In this part，you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet1.For questions 1-7，markY (for YES) if the statement agrees with the information

3、 given in the passage;N (for NO) if the statement contradicts with the information given in the passage;NG (for NOT GIVEN) if the information is not given in the passage;For questions 8-10，complete the sentences with the information given in the passage.One in three of us will get cancer at some poi

4、nt in our lives. Once so feared its name was whispered，the disease is no longer an inevitable death sentence. Today，almost two-thirds of those who develop cancer will still be alive five years later，compared with just half in 1970s.Cancer has turned out to be tougher to crack than everyone hoped whe

5、n U.S. President Richard Nixon launched the War on Cancer in 1971.But death rates are falling，thanks to earlier detection of tumors (肿瘤)and improved use of existing treatmentsmainly chemotherapy and radiotherapy .The success has been biggest for children：since the mid-1970s，death rates from cancers

6、of childhood have halved.Inner workings.A key reason why cancer patients are living longer is that scientists now understand more clearly what happens when cells turn cancerous. Cancer begins when genes which normally control cell division，growth and repair are damaged through mutation(突变).These gen

7、es can then cause cells to grow and divide uncontrollably，destroying neighboring healthy cells.Mutations can arise by chance errors in DNA replication，and genes can also be damaged by carcinogens(致癌物质)such as tobacco chemicals，benzene，and some food additivesor ultraviolet light from sunshine. Certai

8、n viruses can also trigger gene mutations，such as the human papilloma (乳突淋瘤) virus that can cause cervical(子宫颈) cancer. Some mutated genes are inherited：two examples are BRCA1 and BRCA2 ，which together account for about 5% of all breast cancer cases. Other genes such as DBC2，EMSY and FA have been im

9、plicated in ovarian，breast and lung cancer.Once a cell has turned cancerous，it divides until a mass of cells forms a tumor. Diagnostic tests can quickly distinguish between malignant，or cancerous，tumors and those that are benign，or harmless. As a malignant tumor progresses，cells or clumps of cells b

10、reak off and spread，around the body via the lymphatic system and blood vessels.The latest generation of treatments exploit our knowledge of what happens within cancerous cells. These target proteins and messenger chemicalssuch as growth factors or enzymes that the errant cells need to survive and gr

11、ow.Prevalence patternsIn developed countries，the cancer most likely to afflict you is non-melanoma skin cancer，often caused by the Suns harmful ultraviolet rays. This is usually treated and cured. Melanoma，a deadlier skin cancer，is less common but is increasing by around 3% a year in the U.S. Though

12、 UV light is the cause of many skin cancers，there is some evidence that small amounts may also help prevent other cancers. In the developing world the most common cancers are linked to infectious agents，such as cervical cancer or liver cancer，caused by hepatitis （肝炎）B.The biggest killer in industria

13、lized nations remains lung cancer. For men，lung cancer mortality has been falling since 1990，mirroring a peak in popularity of smoking during the 1960s. For women，who commonly took up smoking later，lung cancer mortality is still rising. Tobacco is also rapidly becoming the leading cause of cancer in

14、 Asia.Breast cancer accounts for almost one in three of all cancers diagnosed in women each year. For men，prostate cancer is just as common， with the highest rates in African American men and Caribbean men of African origin.Screening for both of these diseases has improved sharply. Early breast tumo

15、rs show up on a mammogram（乳房X线照片）long before they can be felt as a lump. More women now survive the diseasethree-quarters of women whose breast cancer was diagnosed 10 years ago are still alive today.Similarly，a prostate-specific antigen(PSA)test has revolutionized early diagnosis for this cancer in

16、 the U.S.Some experts argue that screening can be harmful，however.Factoring in riskDozens of factors affect an individuals risk of getting cancer.Smoking is the biggest single risk factorwith tobacco linked to about a third of all cancers.Another clearly established risk factor is exposure to ionizi

17、ng（电离）radiation.This may be responsible for cancers in people living around Chernobyl in Ukraine，Toikamura in Japan and for people working in nuclear power plants.Radiation may also have led to a high incidence of cancer in those who witnessed early nuclear tests or have been in contact with deplete

18、d uranium munitions，though a recent study contests this risk.Risk factors for developing breast cancer include:being childless or delaying childbearing until aged over 30,starting periods early,using hormone replacement therapy，being exposed to oestrogen-like(雌性素类) chemicals,and drinking one or more

19、 units of alcohol daily. More than one risk factor is usually needed before cancer cells develop.Risks posed by living near overhead power lines or petrol stops,or using cell-phones,are less clear.Preventative stepsIf everyone stopped smoking，cancer deaths could be cut by one-third，researchers estim

20、ate. Moves to protect people from passive smoking，in bars for example，are gaining ground in many industrialized countries.Staying out of sunlight and using strong sunscreens could prevent hundreds of thousands of us from developing skin cancer worldwide annually. Foods rich in antioxidants and benef

21、icial fatty acids such as omega-3 and oleic acid found in olive oil a key ingredient of the healthy Mediterranean diet seem to protect against some cancers，although the findings are mixed.Doctors can increasingly intervene directly to prevent cancers. For example，vaccines against hepatitis B could s

22、oon cut deaths from liver cancer . There are also preventive therapies that interfere with the production of the hormone oestrogen，implicated in many breast cancers. Doctors believe that it could have the rates of breast cancer in women with a family history of the disease.All this means that，while

23、hopes of total cure for cancer are still unrealistic，the disease is increasingly under control.注意：此某些试题在答题卡1上作答；810题在答题卡1上。1、The biggest killer in China is liver cancer.2、Some viruses will give rise to gene mutations ，which will result in cancers.3、In the 1970s,only one-third of those who developed

24、cancer could be alive five years later.4、Sunbathing helps us prevent ourselves from developing skin cancer.5、Non-melanoma skin cancer is a deadly skin cancer.6、Cancer patients are living longer than before because scientists know more about cancerous cells.7、Mutated genes which are inherited account

25、 for about 5% of all cancer cases.8、Generally ，one-third of people will get cancer at some point . 9、Aboutof all cancers have something to do with tobacco.10、It is true that for cancer is still impossible but the disease is increasingly under control.Part III Listening Comprehension (35 minutes) Sec

26、tion ADirections：In this section，you will hear 8 short conversations and 2 long conversations. At the end of each conversation，one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During

27、the pause，you must read the four choices marked A)，B)，C) and D)，and decide which the best answer is. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.注意：此某些试题在答题卡2上作答。11、A)The woman should have taken Bus Number 15. B) The woman got on the bus to Grand Theatr

28、e.C) The woman should have asked the conductor. D) The woman was going in the opposite direction.12、A)The next train for Boston will run a bit late because of the weather.B) The next train for Boston will run on time despite the weather. C) The next train from Boston will be late as it is raining he

29、avily. D) The train for Boston will be late as it is foggy.13、A)Stay at home and review the lesson. B) Stay at home and have a good rest.C) Go somewhere else. D) Go to the concert.14、A)The TV program after the news report. B) Whether there is a documentary about the Middle East.C) The news headlines

30、 on todays newspaper. D) The mans feeling about the documentary.15、A)At a supermarket. B) At a bakery.C) At an ice-cream house. D) At a restaurant.16、A)Alan is very careless. B) Alan is weak in health.C) Alan has good friends. D) Alan is disappointed.17、A) its not worth seeing at all.B) Its better t

31、han TV programs anyway.C) its a good change for someone who stays at home for a long time.D) its a bit terrible.18、A)She has a pain in her neck. B) She is very busy with work.C) She feels weak. D) She works in the laundry.Questions 19 to 22 are based on the conversation you have just heard.19、A)At t

32、he airport. B) At the travel agency. C) At the railway station. D) At the information center.20、A)Every 24 hours. B) Every 22 and a half hours.C) Every morning. D) Every noon.21、A)At 11:40 Monday. B) At 11:40 Wednesday.C) At 22:30 Tuesday. D) At 22:30 Wednesday.22、A)The passenger has booked a train ticket.B) The passenger has booked a plane ticket.C) The passenger hasnt decided whether he will go by train or by plane.D) The passenger will come back to book a train tick