81式自动步枪自动方式采用（），枪机回转式闭锁，可实施单、连发射击。
参考答案：导气式
—Did you enjoy the movie?
—No, it was _____.
A．very boring
B．very bored
C．much boring
D．much bored
—What's red and white?
—It's ____.[ ]
A. orange
B. grey
C. green
D. pink
