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【单选题】
《全国青少年网络文明公约》包括（）。 ①要善于网上学习，不浏览不良信息 ②要诚实友好交流，不侮辱欺诈他人 ③要增强自护意识，不随意约会网友 ④要维护网络安全，不破坏网络秩序 ⑤要有益身心健康，不沉溺虚拟时空A.
①②④
B.
①③④⑤
C.
①②③⑤
D.
①②③④⑤
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【单选题】In families with two working parents,who may have more impact on a child's language development?
A.
mother
B.
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C.
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D.
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