国债承销团按照国债品种组建，包括( )。

A．甲类承销团

B．凭证式国债承销团

C．乙类承销团

D．记账式国债承销团

If you see any litter on the playground, you'd better               .[ ]

A. pick up it

B. pick it up

C. go away

D. not touch them