Read the text below and decide which answer best fits each space.
Although they are safe to use in the short term, coal, gas and oil present a long-term (36) ______ to the environment. All three types of fossil fuels produce carbon dioxide in far greater .quantities than plants can use. The carbon dioxide then accumulates in the atmosphere and may even increase the earth's 'heat load' and lead to global (37) _____ in temperature. Furthermore, all three fossil 'fuels are non-renewable forms of energy. Geothermal power is unlikely ever to be an energy source of major importance. It is limited and is exploitable in only a few places. Hydro-power offers a much more useful source of energy. It is also renewable but its (38) ______ is limited. Dams cannot be built in certain areas. In addition, large dams are also capable of causing changes in the world's climate. Wind power is a pollution – free source of renewable energy but it cannot be used in many parts of the world where there is (39) ______ wind. Wave power is better source of energy in certain ways but it is clearly not practicable to build dams across every river estuary or to cover seas with expensive equipment. It is also ineffective where the sea is usually calm. Solar power is renewable, it does not cause pollution and it does not add to the earth's heat load. Unfortunately, solar power is not distributed equally, and in the northern latitudes it is difficult to (40) ______ and store. Solar power' also requires expensive equipment. Finally, nuclear power provides a very efficient and renewable power source. However, not only is there a great danger of leaks or accidents but there is also the problem of the disposal of radioactive waste.
(36)
A.warning
B. fight
C.threat
D.demand
Although they are safe to use in the short term, coal, gas and oil present a long-term (36) ______ to the environment. All three types of fossil fuels produce carbon dioxide in far greater .quantities than plants can use. The carbon dioxide then accumulates in the atmosphere and may even increase the earth's 'heat load' and lead to global (37) _____ in temperature. Furthermore, all three fossil 'fuels are non-renewable forms of energy. Geothermal power is unlikely ever to be an energy source of major importance. It is limited and is exploitable in only a few places. Hydro-power offers a much more useful source of energy. It is also renewable but its (38) ______ is limited. Dams cannot be built in certain areas. In addition, large dams are also capable of causing changes in the world's climate. Wind power is a pollution – free source of renewable energy but it cannot be used in many parts of the world where there is (39) ______ wind. Wave power is better source of energy in certain ways but it is clearly not practicable to build dams across every river estuary or to cover seas with expensive equipment. It is also ineffective where the sea is usually calm. Solar power is renewable, it does not cause pollution and it does not add to the earth's heat load. Unfortunately, solar power is not distributed equally, and in the northern latitudes it is difficult to (40) ______ and store. Solar power' also requires expensive equipment. Finally, nuclear power provides a very efficient and renewable power source. However, not only is there a great danger of leaks or accidents but there is also the problem of the disposal of radioactive waste.
(36)
A.warning
B. fight
C.threat
D.demand
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Hóa Học lớp 12
