绦虫病首选药是
A．槟榔B．南瓜子C．氯硝柳胺D．吡喹酮E．左旋咪唑
参考答案：D
解析： 吡喹酮是各种绦虫病的首选药。
They were exhausted , so that they decided to two days ____.
A．take; of
B．have; on
C．have; off
D．make; off
在Rt△ABC中，∠C=90°，AB=5，BC=4，则cosA=______．
