单项选择题

International Conference on Intelligent User Interfaces was held

A．in November 9～13, 1999.
B．in January 5～8, 1999.
C．in May 15～20, 1999.
D．in September　13～16, 1999.
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单项选择题
Symposium on Visual Languages was held in
A．Seattle, WA, USA．
B．Edinburgh, Scotland.
C．Tokyo, Japan.
D．Calabro, Cosenza, Italy.
单项选择题
The following seems to be
A．letters from readers.
B．emails from computer users.
C．feedbacks from end users.
D．clippings from newspapers.
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