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SCIENTISTS ARE SEARCHING FOR ...FUELS, SUCH AS THE...
SCIENTISTS ARE SEARCHING FOR ...FUELS, SUCH AS THE ENERGY OF SUN, W...
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6. Scientists are searching for ...fuels, such as the energy of sun, water or wind.
A. renewable B. natural C. disable D. alternative
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6.
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DE THI HOC KI 2 THAM KHAO