正确答案:

题目：Paragraph 4__________________．

解析：第四段主要讲述惰性气体的化学性质稳定，是因为最外层电子满足稳定结构。所以D选项What cause the low chemical reactivity of noble gases?“惰性气体化学性质不活跃的原因”正确。

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学习资料的答案和解析：

[单选题]The legislative provision has a great impact on the operations of the department.

clause

解析：【答案】D【解析】provision“规定”。law“法律”；passage“通过”；revision“修正”；clause“条款”。

[单选题]What was Ponzi’s crime?

回答下面的题目：From Ponzi to MadoffThe year was 1920．The country was the United States of America．The man’s name was Charles Ponzi．Ponzi told people to stop depositing money in a savings account．Instead，they should give it to him to save for them．Ponzi promised to pay them more than the bank．For example，a savings account might pay you$5 a year for every$1 00 you deposit．Ponzi，however，would pay you $40 a year for every $1 00 you gave him to hold．Many people thought this was a good plan．They began to give their money to Ponzi．How could Ponzi make so much money for people? This is what he did with the money people gave him：He used some of that money to pay other people who gave him money．However，he also kept a lot of the money for himself．Soon he had $250 million．This was a kind of theft，and it was against the law．The people who gave him their money didn’t think anything was wrong．Ponzi paid them every month，just like a bank．Ponzi continued this way of working for two years．Then one day，he didn’t have enough money to pay all the people．They discovered his crime，and he went to prison for froud．Ninety years later，people began to hear about a businessman in New York named Bernard Mad off．People said he gave good advice about money．They said when they gave him their money，he paid them a lot more than the bank．Mad off helped hospitals，schools，and individuals earn money．Over a period of 40 years，people gave him$1 70 billion．However，no one investigated what he did with themoney．The people who gave Mad off their money also didn’t think anything was wrong because he paid them every month．One day，Mad off didn’t have enough money to pay all the people he needed to pay．That’s when people discovered how Madoff worked：He was taking money from some people to pay other people， just the way Charles Ponzi did．However，this time，instead of losing millions of dollars，people lost billions．Madoff was accused of fraud，and United States government officials arrested him．He didn’t have to go on trial because he said he was guilty．In 2009，a judge sentenced him to 150 years in prison．Bernard Madoff’s crime was even bigger than Ponzi’s．It was the biggest fraud in history．The lesson of this story is clear：When something seems too good to be true，it probably is !For every$100 Ponzi promises to pay people__________．

He didn’t pay people the interests．

解析：句意：庞齐犯了什么罪?本题的关键字是crime，在文章第二段找到相关句为本段最后一句They discovered his crime，and he went to prison for fraud从中我们可以看到，他是因为诈骗入狱的。四个选项中D项他没有给人们支付利息属于诈骗，所以本题选D。

[单选题]第58题应选：

回答下面的题目：UndergrOund Coal Fires Coal burning deep underground in China, India and Indonesia is threatening the environment and human life, scientists have warned. These large scale 51 blazes ( 火焰 ) cause the ground temperature to heat up and kill surrounding vegetation, produce greenhouse gases and can 52 ignite ( 点燃) forest fires, a group of scientists told the annual meeting of the American Association for the Advancement of Science in Denver. The resulting 53 of poisonous elements like mercury can also pollute local water sources and soils, they warned."Coal fires are a global disaster," said Associate Professor Glenn Stracher of East Georgia Collage in Swainsboro, USA. But 54 few people know about them.Coal can heat up on its own, and eventually catch fire and burn, if there is a continuous oxygen supply. The heat produced is not caused to 55 and under the right combinations of sunlight and oxygen, can trigger spontaneous ( 自发的 ) catching fire and burning. This can occur underground, in coal stockpiles, abandoned mines or even as coal is transported. 56 fires in China consume up to 200 million tons of coal per year, delegates were told. In 57 , the U.S. economy consumes about one billion tons of coal annually, said Stracher, 58 analysis of the likely impact of coal fires has been accepted for publication in the International Joomal of Acoal Ecology.. 59 underway, coal fires can burn for decades, even centuries. In the process, they release large 60 of greenhouse gases, poisonous fumes and black particles into the atmosphere.The members of the panel discussed the 61 these fires may be having on global and regional climate change, and agreed that the underground nature of the fires makes them difficult to 62Ultimately, the remote sensing and other techniques should allow scientists to 63 how much carbon dioxide these fires are emitting ( 释放 ). One suggested 64 of containing the fires was presented by Gary Colaizzi, of the engineering firm Goodson, which has developed a heat-resistant grout ( 灌浆 ), which is designed to be pumped into the coal fire to 65 the oxygen supply.第51题应选：

whose

解析：【解析】句意为：__________可能带来的影响的分析煤矿火灾已经发表在国际Joomal Acoal生态学，此处选择引导词引导定语从句修饰限定Stracher。四个选项：A．which B．who C．whose D．what，只有C选项，意思为他的分析，符合文意。

[单选题]The last few weeks have been enjoyable

past