— ____________ is this?
— It's a peach.[ ]
A. Who
B. What
答案：B
It's the kind of music that he can dance _____. [ ]
A. with
B. to
C. along
检测军团菌β-内酰胺酶试验，下列何种颜色变化可判断为阳性（）
A.红色变为黄色
B.黄色变为红色
C.红色变为绿色
D.绿色变为红色
E.红色变为黑色
