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  • Read the text below and decide which answer - a, b, c or d - best fits each space.

    Although they are safe to use in the short term, coal, gas and oil present a long-term (7) ...... to the environment. All three types of fossil fuels produce carbon dioxide in (8) ...... greater .quantities than plants can use. The carbon dioxide then (9) ...... in the atmosphere and may even increase the earth's 'heat load' and lead to global (10) ..... in temperature. Furthermore, all three fossil 'fuels are (11) ...... forms of energy. Geothermal power is (12) ...... 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 (13) ...... is limited. Dams cannot be built in certain areas. In addition, large dams are also (14) ...... of causing changes in the world's climate. Wind power is a (15) ...... source of renewable energy but it cannot be used in many parts of the world where there is (16) ...... wind. Wave power is better source of energy in certain ways but it is clearly not practicable to build (17) ...... 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 (18) ....... Unfortunately, solar power is not distributed equally, and in the northern latitudes it is difficult to (19) ...... and store. Solar power' also requires expensive equipment. Finally, nuclear power provides a very (20) ...... and renewable power source.

    Câu hỏi:

    (6) ____________

    • A. warning
    • B. fight
    • C. threat
    • D. demand

    Lời giải tham khảo:

    Đáp án đúng: C

    ADSENSE

Mã câu hỏi: 3191

Loại bài: Bài tập

Chủ đề :

Môn học: Tiếng Anh

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