She is playing _____in the classroom.[ ]

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问题选择题

She is playing _____in the classroom. [ ]

A. piano

B. the piano

C. a piano

D. an piano

答案

答案：B

选择题

Traditionally, Chinese people _______ the Chinese characters Double Happiness and stick them onto walls or doors at the weddings.

A．look out

B．cut out

C．give out

D．come out

填空题

成组技术虽然经历了“成组加工---成组工艺---成组技术”的发展过程，但其基本原理都是识别和利用事物的（）。