单项选择题

People are always curious because （）.

A．they know nothing about the world
B．they know little about the world
C．there are answers they do not have
D．all of the above

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单项选择题
In how many fields are prizes bestowed（）

A．2.
B．5.
C．6.
D．10.
单项选择题
Sign language is said to be very picturesque and exact and can be used internationally except for （）.

A．spelling
B．ideas
C．whole words
D．expressions
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