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问题 单项选择题

具有收敛固涩作用的是( )

A．辛味
B．咸味
C．酸味
D．淡味
E．苦味

答案

参考答案：C

填空题
信息归纳。
Allan: Hello! May I speak to Bob?
Mary: Sorry! He isn't in at the moment. Tomorrow is Teachers' Day, and he
           has gone to buy some presents for the teachers. Could I take a
           message ?
Allan: Yes, please. My name is Allan. I'm taking the subway to Shanghai for 
           vacation tonight. It is two o'clock now. I am afraid I have no time to
           see him before I leave. Tell him I'll leave in three hours. My phone
           number is three o one double five double seven.
Mary: OK! I'll tell him as soon as he comes back.
Allan: Thank you very much! Goodbye !
Mary: Bye !
Date:1.______________________        __.
Destination(目的地)2.__________________           ___.
Transportation:3.___________________            _.
Time leaving:4.____________________________
Phone number:5.____________________           _
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单项选择题

下列n的取值中，使in=1(i是虚数单位)的是( )

A．n=2
B．n=3
C．n=4
D．n=5
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