Traditionally people believed that obesity resulted from overeating only. Today, however, many doctors believe that it is a (n)

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问题 Traditionally people believed that obesity resulted from overeating only. Today, however, many doctors believe that it is a (n) ______of genes.

选项 A、affair
B、matter
C、thing
D、object

答案B

解析 本题考查名词辨析。It’s a matter of sth.是固定句型,意为“这是……的问题”,故答案为[B]项。
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