Cohesion: Signalling

Exercise 3

In the following article on Nuclear Hazards the signalling words and phrases are missing. Add them and check your answers.

There are three separate sources of hazard related to the use of nuclear reactions to supply us with energy. __________, the radioactive material must travel from its place of manufacture to the power station. __________ the power stations themselves are solidly built, the containers used for the transport of the material are not. __________, there are normally only two methods of transport available, __________ road or rail, and both of these involve close contact with the general public, __________ the routes are bound to pass near, or even through, heavily populated areas. __________, there is the problem of waste. All nuclear power stations produce wastes which in most cases will remain radioactive for thousands of years. It is impossible to de-activate these wastes, and __________ they must be stored in one of the ingenious but cumbersome ways that scientists have invented. __________ they may be buried under the ground, dropped into disused mineshafts, or sunk in the sea. __________ these methods do not solve the problem; they merely store it, __________ an earthquake could crack open the containers like nuts. __________ there is the problem of accidental exposure due to a leak or an explosion at the power station. As with the other two hazards, this is extremely unlikely and __________ does not provide a serious objection to the nuclear programme, __________ 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. Taken together, __________, and especially over much longer periods, the probability of a disaster is extremely high.

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