椒草的叶能发出芽和根,这些芽能生成新的植株,这种生殖方式属于( )
A.孢子生殖
B.有性生殖
C.无性生殖
D.分裂生殖
答案:C
"I'm glad ______ you here in the hotel." "It's my great pleasure to have you ______ us."
A.meeting, to
B.to have met, with
C.having met, among
D.to meet, of
在计算代数式(2x5﹣3x2y﹣2xy2)﹣(x5﹣2xy2+y5)+(﹣x5+3x2y﹣y5)的值,其中x=0.5,y=﹣1时,甲同学把x=0.5错抄成x=﹣0.5,但他计算的结果是正确的.试说明理由,并求出这个结果.