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【单选题】
青藏铁路格（尔木）拉（萨）段全长1142km，其中新建线路（）。
A.
1110km
B.
1000km
C.
1100km
D.
1120km
参考答案：
参考解析：
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举一反三
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers