驻车制动器可以分为（）
A.盘式
B.鼓式
C.嵌入式
D.立式
参考答案：A, B
The dolphins ______ interesting in the zoo. [ ]
A. kind of
B. kinds of
C. are kind of
D. are kinds of
In spite of setbacks and（）his business was at last making money.
A.compliments
B.predictions
C.reversals
D.complement
