单项选择题
A. all but one drug were hazardous B. only a few were good to children C. many of them could curb suicide D. different drugs had varied results
A. had worked too hard in pleasing his fans B. had fallen victim to public opinion C. had been an extremely sentimental guy D. had experienced both joys and sorrows
A. consider DDT’s positive uses B. continue to keep DDT illegal C. remove some restrictions on DDT use D. study DDT’s impact on human health