题目内容
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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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更多“Aluminum is______.A．lightweigh…”相关的问题
If you need a transfusion, the best and safest blood for you is______.
A. type AB
B. exactly the same type as yours
C. a mixture of salt, plasma and type O
D. type A
The main reason that boys are seldom trained to follow their father's business is______.
A．that children also like to have jobs outside
B．that there is a wide choice of employment for children
C．that father do not like to pursue employment at home anymore
D．that children nowadays rarely see their places of work
Aluminum is found on earth mostly in the form. of______.
A．pure metal
B．bauxite
C．gold
D．liquid
(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.
A．The metal
B．has been
C．first
D．early
What is a by-product of burned coal？
A. Aluminum, silicon, and magnetic.
B. Paving material.
C. Fly ash.
D. Concrete additive.
What can be extracted from fine-powder fly ash？
A. Aluminum, silicon, and magnetic.
B. Additive.
C. Paving material.
D. Cement.
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.
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
According to the passage, what attracts man's greater attention？
A. Fly ash.
B. The construction of dams, bricks, and roads.
C. Extracting aluminum, silicon, and magnetic from ash.
D. The available technology.
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 cement.
In the first paragraph, "sawmilling" refers to ______.
A．news-print industry
B．shoe-making industry
C．wood-processing industry
D．mineral refining industry
