【題目】The students are holding a heated discussion about what clothes are______for school wear.
A.formal
B.appropriate
C.correct
D.appreciate

【答案】B
【解析】A. formal正式的；B. appropriate合適的；C. correct正確的；D. appreciate欣賞，感激。句意：同學(xué)們正在熱烈討論是否有必要穿校服。根據(jù)句意可知選B。

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