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【多选题】
人体缺锌时，表现为＿＿＿＿＿。A.
儿童生长发育迟缓、身材矮小、性器官发育不良
B.
味觉异常
C.
异食癖及厌食
D.
创伤难愈合。
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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【单选题】.6.All of a sudden, he lost his interest in engineering, and __ his attention on learning a foreign language.
A.
focus
B.
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C.
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D.
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