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[主观题]

Aluminum is found on earth mostly in the form. of______.A．pure metalB．bauxiteC．goldD．liqui

Aluminum is found on earth mostly in the form. of______.

A．pure metal

B．bauxite

C．gold

D．liquid

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发布时间：2021-10-31

更多“Aluminum is found on earth mostly in the form. of______.A．pure metalB．bauxiteC．goldD．liqui”相关的问题

第1题

When aluminum was first produced about a hundred and fifty years ago, it was so difficult

to separate from the ores(矿石) in which it was found that its price was higher than that of gold. The price remained high until a new process was discovered for refining the metal with the aid of electricity approximately three quarters of a century later. The new method was so much cheaper that aluminum became practical for many purposes, one of which was making pots and pans.

Aluminum is lightweight, rustproof and easily shaped into different forms. By mixing it with other metals, scientist have been able to produce a variety of alloys, some of which have the strength of steel but weigh only one third as much.

Today, the uses of aluminum are innumerable. Perhaps its most important use is in transportation. Aluminum is found in the engines of automobiles, in the hulls of boats. It is also used in many parts of airplanes. In fact, the huge "airbus" planes would probably never have been produced if aluminum did not exist. By making vehicles lighter in weight aluminum has greatly reduced the amount of fuel needed to move them. Aluminum is also being used extensively in the building industry in some countries.

Since aluminum is such a versatile(多用的) metal, it is fortunate that bauxite(铝土矿) , which is one of its chief sources, is also one of the earth's most plentiful substances. As the source of aluminum is almost inexhaustible, we can expect that more and more uses will be found for this versatile metal.

The price of aluminum was sharply reduced when people discovered a new refining process with the aid of______.

A．wind power

B．solar energy

C．hydraulic power

D．electricity

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第2题

（The metal) aluminum （has been) （first) isolated （early) in the nineteenth century.A．The m

(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.

A．The metal

B．has been

C．first

D．early

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第3题

Aluminum is______.A．lightweight, rustproof but not easily shaped into different formsB．hea

Aluminum is______.

A．lightweight, rustproof but not easily shaped into different forms

B．heavyweight, rustproof and easily shaped into different forms

C．lightweight, rustproof and easily shaped into different forms

D．lightweight and easily shaped into different forms but it is easy to become rusty

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第4题

What is the passage talking about？A．The features of aluminum and its functions.B．The proce

What is the passage talking about？

A．The features of aluminum and its functions.

B．The process of aluminum.

C．The discovery of aluminum.

D．The promising future of aluminum.

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第5题

You are on a multiple product tanker and carrying methyl acrylate，diethanolamine，and triet

hylamine. Which statement is TRUE？

A.Methyl acrylate may be loaded in a tank adjacent to diethanolamine but not triethylamine

B.The heating coils to the cargo tank loaded with methyl acrylate must be blanked off

C.Valve components made of aluminum，copper，or zinc may not be in contact with the cargoes

D.Each crew member working on deck must have an emergency escape breathing apparatus

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第6题

完成下列各题 C New Zealand’s main exports come from the natio

n’s farms--wool，meat，butter，cheese，and skins．Many people process farm products in dairies(牛奶房)，meat-refrigerating plants，breweries(啤酒厂)and flour mills．Sawmilling is an important industry where logging is carried on in the forests to make pulp for newsprint and other mills make various kinds of paper． Most of New Zealand’s heavy machinery must be imported，but assembly(装配)plants make automobiles and trucks from imported parts．Woolen goods，carpets，clothing，shoes，furniture and electrical appliances are also manufactured．Imported petroleum(石油)is refined(精炼)at an oil refinery at Whangarei．An aluminum smelter at Blutt，near Invercargill，use hydro—electricity to refine one that is imported from Australia． New Zealand’s coal is used to generate steam，make gases，provide fuel for homes and factories and produce electricity．Sand and gravel(砂砾)used for road building and concrete (混凝土)construction，ranks second to coal．Limestone is used to make fertilizer and ce—ment． In the first paragraph，“sawmilling”refers to________．

A.wood—processing industry

B.shoe—making industry

C.news—print industry

D.mineral refining industry

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第7题

It is unlikely that sufficient teachers_____ unless there is a substantial improvement

A.found

B.were found

C.have been found

D.will be found

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