题目

—Who taught          English?   —Nobody, he learned all by          .     A. him; him B. his; himself C. him; himself D. his; him 答案：C有人在清除果园虫害的时候误喷了一种除草剂，使果园中的某些灌木叶片枯死、脱落。你认为这种除草剂最可能含有（    ）A．生长素B．细胞分裂素C．赤霉素D．乙烯