就下列各句提问。

1. My favorite singer is Zhou Yuming.

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2. His favorite group was Boys & Girls.

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3. Her favorite kind of music is classical.

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4. They took a boy to hospital yesterday.

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5. Tony's birthday is December 23rd.

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6. Their T-shirts are blue and white.

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下列不属于上大学的成本的有( )。

A．书本费

B．住宿费

C．学费

D．因上大学不得不放弃的收入