【題目】He turned from side to side, eyeing himself in the mirror with a serious, studied ______ that soon changed into a smile.
A.impression
B.expression
C.conclusion
D.information

【答案】B
【解析】考查名詞詞義辨析。句意：他從一邊轉(zhuǎn)向另一邊，看著鏡子里的自己從嚴(yán)肅學(xué)究的表情瞬間變成了笑臉。A.impression 印象；B. expression表情，表達(dá)；C. conclusion總結(jié)； D. information信息；根據(jù)句意，故選B項(xiàng)。

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