【摘 要】
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一、单项填空(本题共20小题；每小题1分，共20分) 1．-ne new D-type trains can run at the speed(速度)of 200 to 250 kilometres______hour．
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一、单项填空(本题共20小题；每小题1分，共20分)
1．-ne new D-type trains can run at the speed(速度)of 200 to 250 kilometres______hour．
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