皮皮学，免费搜题
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【多选题】
体育社会问题的特点有哪些?A.
复杂性
B.
局部性
C.
公开性
D.
社会性
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Traffic rules help to keep order on the road. They also help to keep people 1 . The pedestrian(行人) has as many rules to 2 as the driver of a car. You should walk on the sidewalk(人行道) or at the side of...
【单选题】The traffic was making so much noise that i couldn't hear what he( ).
A.
is saying
B.
was saying
C.
has said
D.
will say
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