引起黑热病的病原虫是（）
A.热带利什曼原虫
B.杜氏利什曼原虫
C.巴西利什曼原虫
D.墨西哥利什曼原虫
E.以上都是
参考答案：B
All of us are _____ at the _____ result.
A．surprising; surprised
B．surprised; surprising
C．surprising; surprising
D．surprised; surprised
--- Look! That teacher is explaining something to her students again and again.
--- _________ teacher she is.
A．How patient
B．What a patient
C．How stubborn
D．What stubborn
