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