圆的周长是这个圆半径的[ ]
A.2π
B.3.14倍
C.6.28倍
答案:A
柑桔树开花时,果农常在柑桔园里放养蜜蜂.此举除获取蜂蜜外,对柑桔树的意义是( )
A.促进开花
B.延长花期
C.帮助传粉
D.消灭害虫
.
Much__________he has a good taste, he can’t avoid being influenced by advertisements.
A.that he claims
B.does he claim
C.as he claims
D.is it that he claims