单项选择题

In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.

A．signal



B．chance
C．mark



D．measure
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单项选择题
This coastal area ______ a national wildlife reserve last year.
A. was named
B. named
C. is named
D. names
单项选择题
Advertisements give us ______ about products, such as their prices and uses.
A．information



B．news
C．words
D．pictures
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