题目内容：
Adults' knowledge and mental powers hinder their complete mastery of a foreign language.
参考答案：
答案解析：
单选题：Adults' knowledge and mental powers hinder their complete ma
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The reporter was accused of unprofessional conduct.
The reporter was accused of unprofessional conduct.
下列词语，填入[]最恰当的一项是（ ）。
下列词语，填入[]最恰当的一项是（ ）。
Since the birth of the Barbie doll it has served as a sign t
Since the birth of the Barbie doll it has served as a sign to show the tendency
Since 1959 more and more people are in the market for the Ba
Since 1959 more and more people are in the market for the Barbie doll.
蛛网膜下腔出血的主要体征是（）
蛛网膜下腔出血的主要体征是（）