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【单选题】
小学生在课外开展的气象观察、标本制作等活动属于( )。
A.
科技活动
B.
技能活动
C.
学科活动
D.
社会活动
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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TestDate=date('1／1／2002'1
B.
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B.
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【单选题】支气管肺感染和阻塞是主要发病因素的疾病是
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B.
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