Directions: there are twenty blanks in the following passage. For each blank there are four choices marked A, B, C and D, You should choose the ONE that best fits into the passage. Then mark the corresponding letter on the Answer Sheet.
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 wastes. All nuclear power stations produce wastes which 9 will remain radioactive for thousands of years. It is 10 to deactive 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 call 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.