音响信号中，“紧急停止”信号用口哨（）：
A、断续的长声
B、急促的短声
C、急促的长声
参考答案：C
---____ skirt is blue.____ is red. Which of them do you prefer?
---______ is OK. I like their styles.
A．My; Hers; Neither
B．My; Hers; Either
C．Mine; Her; Both
D．Me; Her; All
— Could I keep your dictionary for a few moments, please?
— _____________ I’m not using it.
A. Sure, come on.
B. Go ahead.
C. That’s great.
