提示付款是行使票据权利的必经程序。( )
参考答案：对
呼吸道中由左右板合成的软骨是（）
A.杓状软骨
B.会厌软骨
C.环状软骨
D.甲状软骨
E.气管软骨
. There are so many kinds of tape-recorders on sale that I can’t make up my mind ____to buy.
A．what
B．which
C．how
D．Where
