单项选择题

How old are the triplet boys now

A．They are six months old.
B．They are two weeks old.
C．They are six weeks old.
D．They are eight weeks old.
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单项选择题
The missing phrase in the incomplete sentence The dog’s-well, we don’t known do we (paragraph 3) refers to______.
A．color blindness
B．depth perception
C．perception of the world
D．concern for our perceptions
填空题
vegetables
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