润滑剂可改善抗胶合性，是防止（）、点蚀、胶合的一个因素。
A、齿轮磨损
B、齿轮破裂
C、齿轮擦伤
D、齿轮剥落
参考答案：B
Seven days ________, the old man died _________ in his own room.[ ]
A. late, peaceful
B. later, peaceful
C. later, peacefully
D. late, peace
—I didn’t know this is a one way street, Sir.
—___________.
A．That’s all right.
B．I don’t believe you.
C．How dare you say that.
D．Sorry, but that’s no excuse.
