下列进行双受精的植物是[ ]
A．肾蕨
B．松树
C．白菜
D．海带
答案：C
The little boy needed the _______ money to deal with the things that remained _______.
A．remaining; to be settled
B．remaining; to settle
C．remained; to be settled
D．remained; to settle
母乳喂养应遵循的原则是（）
A.按时
B.按需
C.按量
D.按时按量
E.按时不按量
