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There are three separate sources of danger in supplying energy by nuclear power(原子能).
First, the radioactive material must travel from its place of production to the power station. Although the power stations themselves are strongly built, the containers used for the transport of the materials are not. Normally, only two methods of transport are in use, namely road or rail. Unfortunately, both of these may have an effect on the general public, since they are sure to pass near, or even through, heavily populated areas.
Second, there is the problem of waste. All nuclear power stations produce wastes that in most cases will remain radioactive for thousands of years. It is impossible to make these wastes nonradioactive, and so they must be stored in one of the inconvenient ways that scientists have invented. For example, they may be buried under the ground, or dropped into deserted mines, or sunk in the sea. However, these methods do not solve the problem, since an earthquake could easily break the containers.
Third, there may occur the danger of a leak(泄漏) or an explosion at the power station. As with the other two dangers, this is not very likely, so it does not provide a serious objection to the nuclear program. However, it can happen.Separately, these three types of dangers are not a great cause for worry. Taken together, though, the probability of disaster(災難) is extremely high.
1.Which of the following is FALSE?
A.It is possible that a leak or an explosion occurs at a power station.
B.It is unusual for radioactive materials to be transported across land.
C.The containers are likely to be broken by an earthquake.
D.Nuclear wastes remain dangerous in most cases for many years. 
2.The author thinks that the ways to store nuclear wastes are ________.
A.easy      B.impossible         C.reasonable        D.ineffective 
3.What do we learn from the last paragraph?
A.The power station is a safe place.
B.The dangers of nuclear energy can be prevented.
C.The general public are strongly against the nuclear program.
By itself, none of the three dangers is very likely to cause much worry.
4.What is this passage about?
A.Uses of nuclear power.          B.Dangers from nuclear power.        
C.Public anger at nuclear power.  D.Accidents caused by nuclear power. 

1----4      BDDB      

1.這是一道細節(jié)題。A選項是第四段表達的觀點；C選項在第三段中“…an earthquake could easily break the containers.”有印證；D選項在第三段“…remain radioactive for thousands of years.”可以找到；而B選項可從第二段第一句話知放射性物質必須從它的生產地運往核電廠，所以，放射性物質的運輸是正常的事，而不是非正常的事。答案為B。 
2.這是一道細節(jié)題。作者在第三段講述了科學家采用的幾種儲存核廢料方法：把核廢料入
地下，扔進廢棄的礦井或沉入大海，但是這樣并沒有解決問題，因為地震可能毀壞容器。作者認為這些方法是不起作用的。答案為D。
3.這是一道句意理解題。從文章最后一句可看出作者認為這三種危險單獨存在并不引起人
們過于擔心，然而三種危險同時發(fā)生那就可能是一場極大的災難。答案為D。
4. 這是一道主旨題。全文講述了生產原子能工程中存在的三種危險：運輸、儲存和泄漏。答案為B。 
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