EXERCISE 13

     Although many governments try to convince their respective subjects that atomic energy is an acceptable alternative _1__ the burning of fossil fuels,no government has taken the least trouble to explain the dangers.Maybe they are __2_ them.__3_ the reason,the public must learn by experience,even though this _4__ may be catastrophic.

     While it is true that nuclear reactors¹ do not produce visible smoke,it is certainly not __5_ that they do not pollute.And the pollution they produce is much more insidious² precisely³ because it is __6_.

     __7_ inconvenient⁴ it may be for governments to publish all the facts,they have no moral excuse for not doing so,__8_ they think they are acting⁵ in our best interest.At least some of the facts are known,even though they are not widely reported.

     Nuclear reactors produce radioactive water and gases in vast _9__.What __10_ all this waste?It is __11_ concrete tanks and stored on tank farms.It is __12_ in disused salt mines.It is run into fractured rock.It is buried.It is __13_ about in special trains.But even when dumped,it has to be kept __14_ by sprinklers to stop it from boiling.And the contents of the tanks are,of course,extremely corrosive⁶.The efforts of a fracture in the tank or a failure of the cooling system would be _15__.

     While every effort is made to _16__ that radioactive wastes do not excape into the sea or _17__ supplies of drinking water,such a leakage⁷ would be too horrible __18_ contemplate⁸.But even then ,governments would presumably continue to belittle⁹ the hazards.

     It seems that __19_ governments can get away with not telling the truth,they will continue to keep silent.Nevertheless the people _20__ to know the full facts.Do you know what happens to the radioactive waste in your country?No?Well—find out!

1)  A  for          B with             C to            D instead of

2)  A  unaware of   B aware of          C unaware from  D aware from

3)  A  however     B whatever          C whenever     D wherever

4)  A  experiment   B government        C danger       D experience

6)  A  visible       B invisible          C disvisible     D unvisible

5)  A  unture       B unreal            C true          D distrue

7)  A  however     B whatever          C whenever     D wherever

8)  A  even        B if even            C if            D even if

 9)  A  numbers     B quality           C quantities      D degree

 10)  A  happens to   B happen to        C happened to     D happening to

 11)  A  put down    B put into          C put up          D puto onto

 12)  A  stored       B storing          C being stored     D to be stored

 13)  A  transporting  B transport        C being transported  D transported

 14)   A  hot        B cooled          C cool             D to cool

 15)   A  disaster    B danger          C a disaster         D disastrous

 16)   A  reassure    B ensure          C convince         D assure

 17)   A  in front of   B behind         C forward          D into

18)   A  against     B that            C to               D too

 19)   A  as long as  B as well as        C as good as        D as smart as

 20)   A  has a right  B with a right      C having a right      D have a right

 答案:

1--5 CABDC 
6--10 BADCA
11--15 BADCD
16--20 BDCAD