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【单选题】
下列有关西气东输三条线路的叙述 , 不正确的是 ( ) 。
A.
中亚天然气是三条输气线路的主要气源地
B.
三条线路同时经过河西走廊
C.
三条线路的建设均有利于促进东西部地区协调发展
D.
三条线路的建设可改善长江三角洲和珠江三角洲地区的大气环境
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【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