属于无性生殖的实例是( )
A.水稻播种
B.嫁接仙人掌
C.雏鸟破壳而出
D.幼苗长成大树
答案:B
—He is tired now. He _____ stay at home and have a rest.
—Thanks, doctor. [ ]
A. has to
B. mays
C. need
D. can't
()调查是权属调查的核心。
A.街道
B.界点
C.街坊
D.界址