Why wouldn’t Uncle Smith come on Saturday？
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听下面一段材料，回答 10～12 题。
第 10 题 When do children start school in the man’s country？
Why is the woman going to give up swimming？
From the letter，we can know＿＿＿．
隧道洞内供衬砌用的临时中线点，必须用（）测定，其间距可视放样需要适当加密。A．水准仪B．测距仪C．全站仪D．经纬仪
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