汽车制动器（）的作用是将由踏板输入的机械推力转换成液压力。
A、制动主缸
B、推杆
C、后活塞
D、制动轮缸
参考答案：A
—Boys and girls, we will have a class trip to Taixing Park next week.
—Great! It must be ______. I simply can’t wait _____ it.
A．a fun, for
B．funny,to
C．fun, to
D．fun, for
– How do you learn to live an easy and happy life ?
– regarding problems as challenges.
A. For B. By C. On
