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【参考答案】

wavelength—改成wavelengths
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单项选择题
A．because they cleaned the ship with lethal liquid.B．as a result of loading poisonous ores.C．as a result of too much exposure to the poisonous gas.D．because of the leakage of lethal gas at the port.
A．because they cleaned the ship with lethal liquid.
B．as a result of loading poisonous ores.
C．as a result of too much exposure to the poisonous gas.
D．because of the leakage of lethal gas at the port.
单项选择题
A．Technical researchB．Investing more money in new machinery.C．Finding out what customers want.D．Exporting more manufactured goods.
A．Technical research
B．Investing more money in new machinery.
C．Finding out what customers want.
D．Exporting more manufactured goods.
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