哪种绦虫的头节没有顶突及小钩（）.
A.牛带绦虫
B.猪带绦虫
C.微小膜壳绦虫
D.细粒棘球绦虫
E.多房棘球虫
参考答案：A
用一个平面去截长方体，三棱柱，圆柱，和圆锥，其中不能截出三角形的几何体是______．
用所给单词的适当形式填空。
1. Please bring some ______ (baseball) to school.
2. These are ______ (he) sister's books.
3. Where ______ (be) his notebook?
4. He needs two ______ (hat).
5. Can you ______ (take) the pencil to your teacher?
