词法学
参考答案：
词法学是研究词的结构、词形变化和词类的科学。
— Could I use your computer for a few moments, please?—__________. I’m not using it myself.
A．Come on
B．It depends
C．Go ahead
D．That’s great
Mr. Black often goes to work by______ bus.
A．a
B．an
C．the
D．/
