题目内容
阅读下列短文,从所给的四个选项中,选出最佳答案
Scientists had long dreamt of splitting the atom(原子) and let out some of its huge quantity of energy.They didn't find out how to do it until the 1940s.
Uranium is one of the matters whose atoms can be split fairly easily.A small particle(粒子) is added to an atom of uranium, which then breaks into two smaller atoms.The change has other results.It makes the uranium very hot.It also produces two or there free particles of the kind first added.These free particles move around, splitting other uranium atoms, and so begins a “chain reaction”(链式反应), which produces more heat and more free particles.Both the heat and the chain reaction are important.
A gas or a liquid is sent into the reactor(反应堆)to collect and carry away the heat.It is used to boil water, and the steam so produced drives the machinery which produces electricity.The chain reaction allows the process(过程) to continue.The reaction, which could be very rapid, is slowed down by a certain matter, which surrounds the fuel.
Today, many people are wondering how long the world's store of coal and oil will last.Both these fuels, like uranium, are producers of heat energy.Is atomic energy the answer to the world's energy problem?
(1) Which of the following words can take the place of the underlined word“splitting”?
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A.joining B.choosing
C.breaking D.heating
(2) What will never happen when a small particle is added to an atom of uranium?
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A.Two more atoms will appear
B.The atom will split in two and let out energy.
C.More free particles will be produced.
D.The uranium will become very hot.
(3) “Chain reaction”means______.
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A.free particles produced in the reaction will split other atoms, which in turn will produce more free particles
B.free particles will split more atoms after splitting some atoms
C.atoms split by free particles will continue to split
D.reaction can go on and on with the help of a chain of particles
(4) Which of the following orders shows rightly how a nuclear (原子能的) power plant works?
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a.Heat is made to boil water.
b.The machinery produces electricity
c.The chain reaction produces heat.
d.Heat is collected and carried away by a gas or a liquid.
e.Steam so produced drives the machinery.
A.d-c-e-b-a B.c-d-a-e-b
C.b-d-e-a-c D.c-a-d-b-e
(5) What fact does this passage lead you to believe?
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A.Many people wonder whether the world's store of coal and oil will last long.
B.Coal, oil and uranium are fuels, which can produce heat.
C.The world's store of coal and oil will last a very long time.
D.Atomic energy has given people hope to solve the world's energy problem.