传动系统具有的功能之一是（）。
A、降低转速，增加扭矩
B、降低转速，降低扭矩
C、增加转速，增加扭矩
D、增加转速，降低扭矩
参考答案：A
I was told that by 1990 things were beginning to improve, _________ quickly enough.
A．even if not
B．even I didn’t improve
C．if not improved
D．if even to improve not
—What's your phone number?
— 7284587. [ ]
A. He's
B. I'm
C. It
D. It's
