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填空题
About how many adult Americans have the “weight problem”?____ percent.
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解析：
数字题。题目问大约有多少成年人有体重问题。录音中提到“In the USA, thirty percent of the adult population has a weight problem”，在美国有百分之三十的成年人有体重问题，故这一比例为30%。
数字题。题目问大约有多少成年人有体重问题。录音中提到“In the USA, thirty percent of the adult population has a weight problem”，在美国有百分之三十的成年人有体重问题，故这一比例为30%。
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