100÷20%×35
=500×35
=300；
故答案为：300．
-What would you rather do this weekend，go to a concert or an art show?
-________Both are exciting to me.[ ]
A．Is that right?
B．It’s up to you.
C．That’s great!
D．I have got that.
蛛网膜下腔阻滞麻醉时，最常用的穿刺部位是（）
A.腰3-4
B.胸12～腰1
C.腰4-5
D.胸10-11
E.骶3
