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题型：单选题题类：常考题难易度：容易

What _____ useful book! And _____ book is popular with students.

A、a; a B、an; a C、a; the D、a;an

举一反三

—What do you know about kite surfing? —It is _________ exciting water sport.

What honest boy! And he is best student of all.

This is Nancy. She is ________from Africa.

— Is that ________ orange?

— Yes, the orange is mine.

—Have you got computer at home?

—Yes. You can send email to me.

There is _______ “r” and _________ “u” in the word “run”.

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