车辆保养是定期（）。
A、强制的
B、需要的
C、规定的
参考答案：C
The poems said________by Sean Cannery will be published next year.
A．having written
B．written
C．to have been written
D．having been written
下列烹调方法中______在火候上要求急火热油速成。
A．炖菜
B．软炸
C．爆菜
D．熘菜
