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根据下列文章,请回答 16～22 题。 Where Has the Salt Come from？ Every now and then, we m

根据下列文章,请回答 16～22 题。

Where Has the Salt Come from？

Every now and then, we meet a fact about our earth that makes us feel strange and no answer for the fact has yet been found. Such a fact is the existence of salt in the oceans. How did it get there？

We simply do not know how the salt got into the ocean! We do know, of course, that salt is water-soluble, and so passes into the oceans with rainwater. The salt of the earth's surface is constantly being dissolved (溶解) and is passing into the ocean.

But we do not know whether this can explain the huge quantity of salt in oceans, tf ait the oceans were dried up, enough salt would be left to build a wall 180 miles high arid a mile thick. Such a wall would reach once around the world at the Equator (赤道)!

The common salt that we all use is produced from seawater or the water of salt lakes, from salt springs (源泉) and from deposits of rock salt. The concentration (浓度) of salt in seawater ranges from about three per cent to three-and-one-half percent. The Dead Sea, which covers an area of about 340 square miles, contains about 11,600,000,000 tons of salt!

On the average, a gallon (加仑) of seawater contains about a quarter of a pound of salt. The beds of rock salt that are found in various parts of the world were all originally formed by the evaporation (蒸发) of seawater millions of years ago. It is believed that the thick rock-salt deposits were formed after about nine-tenth of the volume of seawater had been evaporated.

Most commercial salt is obtained from rock salt. The usual method is to drill wells (井) down to the salt beds. Pure "water is pumped down (抽进去) through a pipe. The water dissolves the salt and it is forced through another pipe up to the surface.

第 16 题 We have not fully understood how salt got into the ocean.

A．Right

B．Wrong

C．Not mentioned

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更多“根据下列文章,请回答 16～22 题。 Where Has …”相关的问题

第1题

根据下列文章,请回答 16～22 题。第 16 题 The astronomer was not interested in the way

根据下列文章,请回答 16～22 题。

根据下列文章,请回答 16～22 题。第 16 题 The astronomer was not

第 16 题 The astronomer was not interested in the way dolphins communicate with each other.

根据下列文章,请回答 16～22 题。第 16 题 The astronomer was not

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第2题

根据下列文章,请回答 16～22 题。 New Product Will Save lives Drinking water that looks

根据下列文章,请回答 16～22 题。

New Product Will Save lives

Drinking water that looks clean may still contain bugs (虫子), which can cause illness. A small company called Genera Technologies has produced a testing method in three stages, Which shows whether water is safe. The new test shows if water needs chemicals added to it, to destroy anything harmful. It was invented by scientist Dr Adrian Parton, who started Genera five years ago. He and his employees have developed the test together with a British water company.

Andy Headland, Genera's marketing director, recently presented the test at a conference in the USA and forecast good American sales for it. Genera has already sold 11 of its tests at $42,500 a time in the UK and has a further four on order. It expects to sell another 25 tests before the end of March. The company says it is the only test in the UK" to be approved by the government.

Genera was formed five years ago and until October last year had only five employees; it now employs 14. Mr Headland believes that the company should make around $19 million by the end of the year in the UK alone.

第 16 题 Genera Technologies has developed a method that determines whether water is clean.

A．Right

B．Wrong

C．Not mentioned

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第3题

根据下列材料请回答 16～22 题：第 16 题 A petition needs to be signed.

根据下列材料请回答 16～22 题：

根据下列材料请回答 16～22 题：第 16 题 A petition needs to be s

第 16 题 A petition needs to be signed.

根据下列材料请回答 16～22 题：第 16 题 A petition needs to be s

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第4题

根据下列文章,请回答 16～22 题。 Breakfast Studies show that Children who eat breakfast

根据下列文章,请回答 16～22 题。

Breakfast

Studies show that Children who eat breakfast do better in sch001.It doesn't take much further thought to believe that adults will feel better and perform. better at work as well. Whether you work at home，on the farm，at the office，at school. or on the road，it is not a good idea to skip（故意略去）breakfast.

1f we don't eat. breakfast；We are likely to become tired when our brains and bodies run low on fuel. By mid；morning，a lot of US grab a cup of coffee，or wolf down a sugary candy bar to wake up again，his might work for a few minutes，but by lunchtime we are hungry，bad-tempered，and perhaps our mood might make US a little more likely to make unhealthy choices at lunch. Eating a good breakfast sets the tone for the rest of the day.

People who eat breakfast are generally more likely to maintain a healthy weight. Many people believe that they w-II lose weight if they skip meals，but that isn't a good idea. The body expects to be refueled a few times a day，so start with a healthy breakfast. A healthy breakfast；Should contain some protein（蛋白质）and some fiber（纤维）。

Protein can from meat，eggs，beans，or soy（大豆）。Fiber can be found in whole cereals（谷物），grains or in fruits. A good example of a healthy breakfast might be something simple a hard boiled e99，an orange，and a bowl of whole grain cereal with soy milk.

第 16 题 Adults who eat breakfast will perform. better at work.

A．Right

B．Wrong

C．Not mentioned

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第5题

根据下列材料请回答 16～22 题：第 16 题 Andersen died on April 4, 1875.

根据下列材料请回答 16～22 题：

根据下列材料请回答 16～22 题：第 16 题 Andersen died on April 4

第 16 题 Andersen died on April 4, 1875.

根据下列材料请回答 16～22 题：第 16 题 Andersen died on April 4

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第6题

根据下列文章,请回答 16～22 题。 Nurses The physicians in a hospital form. the core of

根据下列文章,请回答 16～22 题。

Nurses

The physicians in a hospital form. the core of the medical staff．But they could not provide effective medical care to their patients without the help of numerous Other medical workers．From the angle of the patients，the nursing staff is particularly important．Nurses are usually in close contact with patients as long as they are in the hospital．

A nurse does not study for as many years as a doctor．However, each must be equally trained．Caring for sick persons requires a great deal of patience and concern．Most nurses work long days．and they often must work at odd hours or during the night．

The nursing staff in a hospital is usually quite large and various．Nursing services，after all。must be provided on a 24．hour basis．There are professional(专业的)nurses，practical nurses。nurse’s aids，and orderlies(勤杂工)．The general term nurse refers to ta person trained to offer bedside care to sick persons．

Under the supervision(管理)of the head nurse，the nursing staff in a hospital ward must attend to patients’ needs．This responsibility continues around the clock，and SO nudes must work in shifts．A shift is a period of duty，usually eight hours in length．The nurses on the ward rotate(轮换)their shies．Some take turns working night duty；Others work odd shifts．All of them work out of a central area on the ward called the nurse’s station．

A nurse must always be on her guard．She can never afford to be careless．This is true in all nursing situations，but it is especially true in the intensive care unit．Patients under intensive care are critically ill，and they must be monitored at all times．The nurses who do intensive care duty have one of the most demanding jobs in the hospital．

第 16 题 The physicians in a hospital are less important than the nursing staff．

A．Right

B．Wrong

C．Not mentioned

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第7题

根据下列材料请回答 16～22 题：第 16 题 Genera Technologies has developed a method th

根据下列材料请回答 16～22 题：

根据下列材料请回答 16～22 题：第 16 题 Genera Technologies has

第 16 题 Genera Technologies has developed a method that determines whether water is clean.

根据下列材料请回答 16～22 题：第 16 题 Genera Technologies has

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第8题

根据下列材料请回答 16～22 题：第 16 题 The people of KIRIBATI worry that one day the

根据下列材料请回答 16～22 题：

根据下列材料请回答 16～22 题：第 16 题 The people of KIRIBATI w

第 16 题 The people of KIRIBATI worry that one day their country will be taken away by a sudden high tide.

根据下列材料请回答 16～22 题：第 16 题 The people of KIRIBATI w

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第9题

根据下列材料请回答 16～22 题：第 16 题 Some people dream but cannot remember their d

根据下列材料请回答 16～22 题：

根据下列材料请回答 16～22 题：第 16 题 Some people dream but ca

第 16 题 Some people dream but cannot remember their dreams.

根据下列材料请回答 16～22 题：第 16 题 Some people dream but ca

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第10题

根据下列短文，回答 16～22 题。第 16 题 The basic model of A3XX can carry more than 50

根据下列短文，回答 16～22 题。

根据下列短文，回答 16～22 题。第 16 题 The basic model of A3XX

第 16 题 The basic model of A3XX can carry more than 500 passengers.

根据下列短文，回答 16～22 题。第 16 题 The basic model of A3XX

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