[外语类试卷]大学英语四级模拟试卷339及答案与解析.doc
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1、大学英语四级模拟试卷 339及答案与解析 一、 Part I Writing (30 minutes) 1 For this part, you are allowed 30 minutes to write a composition on the expenditure structure of college students with the title of Can You Make Ends Meet. You should write at least 120 words following the outline given below in Chinese: 1. 试述你目前
2、的消费水平 (如平均每月消费金额、主要用于哪些方面及各方面所占总金额的比重 )。 2你主要的生活来源是什么 ?你有否通过其他方式补贴你的生活? 3你认为目前大学生消费存在哪些方面的问题? 二、 Part 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 attached to the passage. For
3、questions 1-7, mark: Y (for YES) if the statement agrees with the information given in the passage; N (for NO) if the statement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in the passage. 1 The Nuclear Age The Earth exploded into the nuclear a
4、ge on 16 July 1945. On that day, the US tested a completely new type of weapon in the New Mexico desert. Crafted from a tennis-ball-sized plutonium sphere (钚球 ), the bomb produced an explosion equivalent to 20,000 tons of TNT. Sixty years on, tens of thousands of tonnes of plutonium and enriched ura
5、nium (浓缩铀 ) have been produced. The global nuclear arsenal (兵工厂 ) stands at about 27,000 bombs. Nine countries very proba-bly possess nuclear weapons,while 40 others have access to the materials and technology to make them. But nuclear technology has also been used for peaceful means. The first nucl
6、ear reactor to provide electricity to a national grid opened in England in 1956. Now, 442 reactors in 32 nations produce 16% of the worlds electricity. Nuclear power has been championed as a source of cheap energy. But this was weakened at the end of the 20th century by reactor accidents, the proble
7、ms of radioactive waste disposal, competition from more-efficient electricity sources and unavoidable links to nuclear weapons proliferation (核武器扩散 ). Nonetheless, growing evidence for global warming had led some to argue that nuclear power is the only way to generate power without emitting greenhou
8、se gases. Dropping the bomb The Hiroshima (广岛 ) bomb was made of enriched uranium, compressed by detonating explosives to achieve a supercritical mass (超临界质量 ). The Nagasaki(长崎 ) bomb was made of plutonium. Following 1945, the US developed massively destructive hydrogen bombs. Some are equivalent to
9、 many millions of tons of TNT, and yield vast amounts of energy through nuclear fusion. Nuclear weapons technology has been adapted for many military uses, such as intercontinental missiles, huge fission (裂变 ) weapons, mini-nukes (微型核弹 ), gamma ray weapons, nuclear landmines (地雷 ), and nuclear defen
10、ce missiles. By bombing Japan, the US started a worldwide arms race, and the Cold War with the Soviet Union. The Soviets developed and tested their own bomb in 1949. The United Kingdom achieved the feat in 1952, followed by France in 1960, China in 1964 and most recently India and Pakistan in 1998.
11、Israel is widely thought to possess nuclear weapons and North Korea declared in 2005 that it did too, though neither has conducted tests. Iraq and Libya (利比亚 ) have attempted to develop them in the past, and Iran has been accused of having a secret nuclear weapons programme. Stopping the Spread Whil
12、e up to nine nations have nuclear weapons, 187 others have promised not to manufacture them. Twenty countries such as Switzerland, Brazil, Argentina, Canada and South Africa once had programmes; but as signatories to the 1968 Treaty on the Non Proliferation of Nuclear Weapons (NPT), later abandoned
13、them. The NPT aimed to limit the spread of atomic weapons and bound the five original nuclear weapons states to sharing nuclear technology and materials for peaceful means mainly through US and Russian disarmament, the treaty has achieved the decommissioning (退役 ) of 38,000 warheads (弹头 ) since 1986
14、. However, the treaty is under strain in 2005. Nuclear-armed states stand accused of failing to reduce their arsenals (兵工厂 ), and of considering new weapons, like mini-nukes. Iran reached an agreement with Europe to halt uranium enrichment activities, but may renege (食言 )on that deal. The 1996 Compr
15、ehensive Nuclear Test Ban Treaty is an attempt to limit test detonations and slow nuclear armament, but the US senate refused to approve of it in 1999. Controlling the remains of the Soviet Unions vast and poorly protected nuclear arsenal is another great challenge. The International Atomic Energy A
16、gency is struggling to keep track of smuggling and the black market in nuclear materials and technology, and fears of terrorists acquiring a dirty bomb are frequently expressed. The sale of materials and information was highlighted in 2004, when a Pakistani nuclear scientist admitted to selling nucl
17、ear technology to Libya, North Korea and Pakistan. Atoms for peace Nuclear power generation has been linked to nuclear weapon proliferation. In fact, the first industrial-scale reactors, built in the US in 1944, were designed to produce plutonium for weapons and the energy generated was wasted. The
18、first nuclear reactor to provide electricity to a national grid opened in Calder Hall in England in 1956. Today countries such as Japan and France use nuclear power to provide up to 75% of their energy. Nuclear fuel has also been used to power submarines, such as Russias doomed Kursk; spacecraft suc
19、h as Cassini, Galileo and the failed Mars-96; and ice breakers, aircraft carriers and other ships. The Pentagon (五角大 楼 ) even briefly entertained the idea of a nuclear powered jet. Going critical However, several high profile accidents damaged public confidence in nuclear power. The worst US nuclear
20、 accident was in 1979, when a cooling system broke down at Three Mile Island in Pennsylvania. The reactor melted down, releasing radioactive gas into the environment. There are now concerns about safety with other ageing US reactors. The worlds most serious nuclear accident happened in 1986, at Cher
21、nobyl (前功联乌克兰北部城市 ) in Ukraine. The radiation released killed 30 people directly and spread over northern Europe. The accident has led to radiation induced conditions such as thyroid (甲状腺癌 ) cancers and leukaemia (白血病 ), birth defects, baby deaths and pollution of lakes and forests. Three other reac
22、tors at Chernobyl began working again in 1988, but the last finally closed in 2000 after Western nations eventually paid Ukraine to close it. Similar reactors in Eastern Europe may be just as dangerous. In 1999, 70 people were exposed to radiation in Japans Tokaimnra uranium processing plant after w
23、orkers added seven times the safe quantity of uranium to a settling tank. This caused an uncontrolled chain reaction. Many dangerous accidents have occurred in facilities such as Windscale, Sellafield, Mayak, Monju, Tsuruga and Mihama. Radioactive nuclear waste-which remains dangerous for many thous
24、ands of years-is another serious drawback of the industry. Governments have considered disposing of it by reprocessing; burying it deep underground, such in Nevadas Yucca Mountain in the US; burning it; shipping it to other coun tries; destroying it with giant lasers; encasing it in glass blocks and
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- 外语类 试卷 大学 英语四 模拟 339 答案 解析 DOC
