单项选择题

A．Nine out of ten cats have a better chance of survival.
B．What is the significance of the seventh floor
C．What’’s the cats’’ terminal speed
D．Most cats can survive when falling.
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单项选择题
Unless children have other people in their lives who speak another language, they won’’t become fluent speakers in that language.
A．Y
B．N
C．NG
单项选择题
What might barter mean in the second paragraph
A．Trade with the exchange of money.
B．Trade with the exchange of coins.
C．Trade based on credits.
D．Trade without the exchange of money.
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