劣质农药
参考答案：
是指不符合农药产品质量标准的或失去使用效能的或混有导致药害等有害成分的农药。
Do you have any idea of how many gold medals China won in the 16th Asian Games, _____ was hosted
in Guangzhou? [ ]
A. as
B. whose
C. that
D. which
地球上淡水的主体是（）
A.海洋水
B.河流水
C.地下水
D.冰川
