题目内容（请给出正确答案）

[主观题]

Lead deposits, which accumulated in soil and snow during the 1960's and 70's, were primari

ly the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.

A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining.

In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Canadian gasolines and thus enabled scientists to differentiate the lead sources. The dominant lead ratio found in Greenland snow matched that found ingasoline from the United States.

In a study published in the journal Ambio, scientists found that levels in soil in the Northeastern United States had decreased markedly since the introduction of unleaded gasoline.

Many scientists had believed that the lead would stay in soil and snow for a longer period.

The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990. The forest environment processed and redistributed the lead faster than the scientists had expected.

Scientists say both studies demonstrate that certain parts of the ecosystem respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.

The study published in the journal Nature indicates that

A．the Clean Air Act has not produced the desired results.

B．lead deposits in arctic snow on the increase.

C．lead will stay in soil and snow longer than expected.

D．the U.S. is the major source of lead pollution in arctic snow.

如搜索结果不匹配，请联系老师获取答案

您可能会需要：

重置密码查看订单联系客服

安装赏学吧APP，拍照搜题省时又省心！

更多“Lead deposits, which accumulat…”相关的问题

第1题

Among the more colorful characters of Leady]11e,5 golden age were H. A. W. Tabor and h

is second wife, Elizabeth MeCourt, better known as "Baby Doe". Their history is fast becoming one of the legends of the Old West. Horace Austin Warner Tabor was a school teacher in Vermont. With his first wife and two children he left Vermont by covered wagon in 1855 to a homestead in Kansas. Perhaps he did not find farming to his liking. or perhaps he was l ured by rumors of fortunes to be made in Colorado mines. At any rate, a few years later he moved west to the small Colorado mining camp known as California Gulch, which he later renamed Leadville when he became its leading citizen. "Great deposits of lead are sure to be found here',he said

As it turned out, it was silver, not lead, that was to make Leadville' s fortune and wealth. Tabor knew little about mining himself, so he opened a general store, which sold everything from boots to salt, flour, and tobacco. It was his custom to " grubstake" prospective miners, in other words, to supply them with food and supplies, or "grub", while they looked for ore, in return for which he would get a share in the mine if one was diswvered. He did this for a number of years, hut no one that he aided ever found anything of value

Finally one day in the year 1878, so the story goes, two miners came in and asked for 'grub". Tabor had decided to quit supplying it because he had lost too much money that way. These They "Oh help yourself One more time won't make any difference," He said and went on selling persistent, however, and Tabor was busy to argue with them shoes and hats to other customers. The two miners took $17 worth of supplies, in return for which they gave Tabor a one-third interest in their findings. They picked a barren place on the mountainside and began to dig. After nine days they struck a rich vein of silver Tabor bought the shares of the other two men, and so the mine belonged to him alone. This mine, known as the "Pittsburgh Mine," made$1 300 000 for Tabor in return for his $17 investment

Later Tabor bought the Matchless Mine on another barren hillside just outside the town for $117 000 This turned nut to be even more fabulous than the Pittsburgh, yielding $35 000 worth of silver per day at one time Leadville grew Tabor became its first mayor, and later became lieutenant governor of the state

36. Leadville got its name for the following reasons EXCEPT because _________

A. Tabor became its leading citizen

B. great deposits of lead is expected to be found there

C. it could bring good fortune to Tabor

D. it was renamed

37. The word "grubstake" in paragraph 2 means_______________

A. to supply miners with food and supplies

B. to open a general store

C. to do one's contribution to the development of the mine

D. to supply miners with food and supplies and in return get a share in the mine, if one was discovered

38. Tahor made his first fortune_____________

A. by supplying two prospective miners and getting in return a one-third interest in the findings

B. because he was persuaded by the two miners to quit supplying

C. by buying the shares of the others

D. as a land speculator

39. The underlying reason for Tabor's life career is________________-

A. purely accidental

B. based on the analysis of miner' s being very poor and their possibility of discovering profitable mining site

C. through the help from his second wife

D. he planned well and accomplished targets step by step

40. If this passage is the first part of an article, who what might be introduced in the following part？_________________

A. Tabor's life

B. Tabor's second wife, Elizabeth McCourt

C. Other colorful characters

D Tabor's other careers

点击查看答案

第2题

阅读理解：选择题Among the more colorful characters of Leadville's golden age were H.A

阅读理解：选择题

Among the more colorful characters of Leadville's golden age were H.A.W. Tabor and his second wife, Elizabeth McCourt, better known as “Baby Doe”. Their history is fast becoming one of the legends of the Old West. Horace Austin Warner Tabor was a school teacher in Vermont. With his first wife and two children he left Vermont by covered wagon in 1855 to homestead in Kansas. Perhaps he did not find farming to his liking, or perhaps he was lured by rumors of fortunes to be made in Colorado mines. At any rate, a few years later he moved west to the small Colorado mining camp known as California Gulch, which he later renamed Leadville when he became its leading citizen. “Great deposits of lead are sure to be found here.” he said.

As it turned out, it was silver, not lead, that was to make Leadville's fortune and wealth. Tabor knew little about mining himself, so he opened a general store, which sold everything from boots to salt, flour, and tobacco.『It was his custom to “grubstake” prospective miners, in other words, to supply them with food and supplies, or “grub”, while they looked for ore, in return for which he would get a share in the mine if one was discovered. He did this for a number of years, but no one that he aided ever found anything of value.

Finally one day in the year 1878, so the story goes, two miners came in and asked for “grub”. Tabor had decided to quit supplying it because he had lost too much money that way. These were persistent, however, and Tabor was too busy to argue with them. “Oh help yourself. One more time won't make any difference,” He said and went on selling shoes and hats to other customers. The two miners took $17 worth of supplies, in return for which they gave Tabor a one-third interest in their findings. They picked a barren place on the mountain side and began to dig. After nine days they struck a rich vein of silver. Tabor bought the shares of the other two men, and so the mine belonged to him alone. This mine, known as the “Pittsburgh Mine,” made 1 300 000 for Tabor in return for his $17 investment.

Later Tabor bought the Matchless Mine on another barren hillside just outside the town for $117 000. This turned out to be even more fabulous than the Pittsburgh, yielding $35 000 worth of silver per day at one time. Leadville grew. Tabor became its first mayor, and later became lieutenant governor of the state.

操作提示：通过题干后的下拉框选择题目的正确答案。

1. Leadville got its name for the following reasons EXCEPT {A、B、C}.

A. because Tabor became its leading citizen

B. because great deposits of lead is expected to be found there

C. because it could bring good fortune to Tabor

2. The word “grubstake” in paragraph 2 means {A、B、C}.

A. to supply miners with food and supplies

B. to open a general store

C. to supply miners with food and supplies and in return get a share in the mine, if one was discovered

3. Tabor made his first fortune {A、B、C}.

A. by supplying two prospective miners and getting in return a one-third interest in the findings

B. because he was persuaded by the two miners to quit supplying

C. by buying the shares of the other

4. The underlying reason for Tabor's life career is {A、B、C}.

A. purely accidental

B. based on the analysis of miner's being very poor and their possibility of discovering profitable mining site

C. through the help from his second wife

5. If this passage is the first part of an article, who might be introduced in the following part？ {A、B、C}

A. Tabor's life.

B. Tabor's second wife, Elizabeth McCourt.

C. Other colorful characters.

点击查看答案

第3题

Which deposits least and most costly for banks?

点击查看答案

第4题

论述about core deposits

(1)the definition of core deposits

(2)importance of core deposits

(3)which is the mostly costly deposit and which is the leastly costly deposit?

点击查看答案

第5题

Commercial Banks are an institution which accepts deposits, makes __________, and offe

A.loans

B.cases

C.decisions

D.orders

点击查看答案

第6题

Which of the following is excluded from the commercial bank deposits？A．Demand deposits.B．T

Which of the following is excluded from the commercial bank deposits？

A．Demand deposits.

B．Time deposits.

C．Checking accounts.

D．Treasury bills.

点击查看答案

第7题

Chinese mainland's （) money supply, which covers cash and an array of deposits,

A.wide

B.broad

C.board

D.aboard

点击查看答案

第8题

单句理解听力原文：These time deposits earn higher interest rates, which may be fixed or flo

单句理解

听力原文：These time deposits earn higher interest rates, which may be fixed or floating, but no withdrawals are allowed until the term has ended.

(1)

A．Sometimes the interest rates on time deposits are not fixed.

B．People can draw these deposits at any time.

C．The interest rates on time deposits are fixed.

D．The interest rates on time deposits are floating.

点击查看答案

第9题

Which of the following is not mentioned in the passage？A．CDs are a kind of consumer time d

Which of the following is not mentioned in the passage？

A．CDs are a kind of consumer time deposits.

B．All the consumer or personal time deposits are non-negotiable.

C．No money interest is paid on personal time deposits.

D．The interest yields of consumer CDs are closer to market interest rates.

点击查看答案

第10题

听力原文：W: Then certified checks, cashier's and cash letters of credit are "all variants

of demand deposits.

M: Yes, that's right.

Q: Which of the following is not one form. of demand deposits？

(13)

A．Cashier's.

B．Savings certificate.

C．Cash letters of credit.

D．Certified cheeks.

点击查看答案

警告：系统检测到您的账号存在安全风险

为了保护您的账号安全，请在“赏学吧”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！

微信搜一搜

赏学吧

点击打开微信

警告：系统检测到您的账号存在安全风险

抱歉，您的账号因涉嫌违反赏学吧购买须知被冻结。您可在“赏学吧”微信公众号中的“官网服务”-“账号解封申请”申请解封，或联系客服。

微信搜一搜

赏学吧

点击打开微信