单项选择题

From the passage we know the quality of the products ________.

A．is as high as before
B．is lower
C．is improved
D．is reduced
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单项选择题
The number of tigers in this area _________ said to be _________.
A．is; rising
B．are; rising
C．is; raised
D．are; raised
单项选择题
We were talking about the American tourists _________ we met during our trip to the Great Wall.
A．what
B．which
C．whom
D．whose
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