听力音频：
Question 31-34
Comple the sentences below with NO MORE THAN TWO WORDS.
Fumigation
Impacts:
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chemicals such as Methyl Bromide may affect ______ layer.
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common fumigants: Methyl Bromide damage the ______ of painting.
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Food should be protected in a sealed ______
Time and settings:
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If applied in more humid area, Fumigation practice will be more ______.
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Exposure time for above 53°F needs up to ______ days.
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In organic environment, atmosphere method apply gas of ______ for pest control.
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German scientists successfully preserved a ______
Biological measurements:
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Chemical from some skins of ______ is another way of pest control.
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Other bilogical method such as natural occurring diseases to kill the ______
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biological control is less effective in a higher ______ environment.
答案
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