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There are three separate sources of hazard(1)to the use of nuclear reaction to supply us with energy. Firstly, the radioactive material must travel from its place of manufacture to the power station. (2)the power stations themselves are solidly built, the container used for transport of the material are not. Unfortunately, there are(3)only two methods of transport available, (4)road or rail, and both of these (5)close contact with the general public, (6)the routes are(7)to pass near, or even through, (8)populated areas.
Secondly, there is a problem of wasters. All nuclear power stations produce wastes which(9)will remain radioactive for thousands of years. It is(10)to de-active these wastes, and so they must be stored(11)one of the ingenious but cumbersome ways that scientists have invented. For example, they must be buried under the ground(12)sunk in the sea. However, these(13)do not solve the problem completely, they merely store it, since an earth-quake could(14)open the containers like nuts.
Thirdly, there is the problem of accidental exposure(15)to a leak or an explosion at the power station. (16)with the other two hazards, this is not very likely and does not provide a serious(17)to the nuclear program,(18)it can happen, as the inhabitants of Harrisburg will tell you.
Separately, and during short periods, these three types of risk are no great cause for concern. (19), though, and especially(20)much longer periods, the probability of a disaster is extremely high.

问题1选项
A.related
B.connected
C.associated
D.affiliated
问题2选项
A.Hence
B.Although
C.Therefore
D.However
问题3选项
A.regularly
B.typically
C.normally
D.commonly
问题4选项
A.such as
B.for example
C.for instance
D.namely
问题5选项
A.concern
B.involve
C.include
D.contain
问题6选项
A.since
B.although
C.while
D.so
问题7选项
A.bound
B.close
C.near
D.sure
问题8选项
A.much
B.heavily
C.closely
D.crowdedly
问题9选项
A.in most cases
B.in the most cases
C.in any cases
D.in such cases
问题10选项
A.important
B.improbable
C.impossible
D.incredible
问题11选项
A.in
B.by
C.with
D.on
问题12选项
A.then
B.than
C.or
D.and
问题13选项
A.means
B.ways
C.measures
D.methods
问题14选项
A.crack
B.crash
C.clash
D.collide
问题15选项
A.attached
B.due
C.relevant
D.owing
问题16选项
A.contacted
B.compared
C.matched
D.contrasted
问题17选项
A.disapproval
B.disagreement
C.protest
D.objection
问题18选项
A.but
B.since
C.so
D.hence
问题19选项
A.Taking together
B.Taken together
C.Having taken together
D.Having been taken together
问题20选项
A.in
B.at
C.over
D.for
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