填空题

【参考答案】

Schools in fifty states have their own rules and regulations......

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填空题
Not until we learned the facts did we realize ______. (噪音污染的危害)
单项选择题
A．The library is closed tonight.B．He doesn’t know how to get to the library.C．Jean is using his car.D．He won’t be able to help the woman.
A．The library is closed tonight.
B．He doesn’t know how to get to the library.
C．Jean is using his car.
D．He won’t be able to help the woman.
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