氮磷钾作物需要量大，土壤又不能满足，需以肥料形式补充，称为（）。
参考答案：肥料三要素
How close parents are to their children ________ a strong influence on the development of the
children's characters. [ ]
A. has
B. had
C. having
D. have
下列短语中属于联合结构的是（）。
A.伟大光荣
B.坐车回家
C.读书看报
D.作家画家
E.流水淙淙
