题目内容：
儿童锌缺乏的表现是
A．皮炎 B．肝脾大
C．伤口愈合快
D．生长发育落后
E．易感冒
参考答案：
答案解析：
单选题：儿童锌缺乏的表现是
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B．肝脾大
C．伤口愈合快
D．生长发育落后
E．易感冒
B．肝脾大
C．伤口愈合快
D．生长发育落后
E．易感冒
体质指数（BMI）是指
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We use the same part of the brain for music and language.
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Holonyak believed that his students that were working with h
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请根据短文内容，回答题。Inventor of LEDWhen Nick Holonyak set out to cre
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The estimate of the number of planets that could support lif
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