单项选择题
What is the author's attitude towards the environmental effects of pesticides
A．Pessimistic.
B．Indifferent.
C．Defensive.
D．Concerned.
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单项选择题
A．Disappointed.B．Sad.C．Happy.D．Regretful.
A．Disappointed.
B．Sad.
C．Happy.
D．Regretful.
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