夜交藤的功效是( )
A．淡味 B．苦味 C．酸味 D．咸味 E．辛味
参考答案：C
—Mr. Lee, you have got the first prize in the competition. Congratulations!
— _______.
A．That’s my good luck
B．Oh. It’s nothing
C．Thank you
D．You can do it, too
拨号音是（）的鸣音，表示电话局的交换设备空闲，可以拨号。
A.断续
B.连续
C.15送，45断
D.五级响度逐级上升
