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A．That every penny counts.
B．He is important.
C．He is talkative.
D．That stocks are important.
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单项选择题
A．Because farmers use less insecticides now.B．Because farmers have been using insecticides for many years.C．Because insects are using the mechanisms against poisons produced by plants to. deal with insecticides.D．Because insects have been eating plants for many million years.
A．Because farmers use less insecticides now.
B．Because farmers have been using insecticides for many years.
C．Because insects are using the mechanisms against poisons produced by plants to. deal with insecticides.
D．Because insects have been eating plants for many million years.
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Joyce Swenson
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