长拳主要手型有（）
A.爪
B.掌
C.拳
D.勾
参考答案：B, C, D
同一发电车各柴油发电机组须均衡使用，各机组运转工时差最多不得超过（）。
A.80h
B.90h
C.100h
D.110h
Miss Green is popular with her students as she always tries to make them _________ in her classes.
A．interested
B．interesting
C．interest
D．to interest
