单项选择题

It can be said from the survey that chicken is________.

A．a popular food
B．a main dish
C．cheaper than any other food
D．all of the above
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单项选择题
Braille, the universally accepted________ of writing used by blind persons, consists of sixty-three characters.
A．catalog
B．system
C．pattern
D．scheme
单项选择题
The sellers signed the________ promising to ship the goods before the end of July.
A．contact
B．treaty
C．agreement
D．contract
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