微小膜壳绦虫的幼虫是（）
A.囊尾蚴
B.棘球蚴
C.泡球蚴
D.裂头蚴
E.似囊尾蚴
参考答案：E
若a-b=2，b-c=-3，c-d=5，则（a-c）（b-d）÷（a-d）=______．
小题1:He is stone deaf.
小题2:Watch out! There’s a car coming!
小题3:The policeman followed the thief into s supermarket.
小题4:I moved here when I was five.
小题5:It seems that they are on the playground.
