单项选择题

The most important features in the growth of American economy in the early 20th cenruty were（）

A.the use of steam and electricity as chief energy,the development of lare corporation and the development of railway
B.the development of large corporation,urbanization and the employment in production of new technology
C.the appearance of airplane,the use of electricity on a large scale and urbanization
D.the rapid development of industry,railway and large cities

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单项选择题

One of the important decisions at the Yalta Conference was（）

A.the allied landing at Normandy
B.the setting-up of a world organization,the United Nations,to manage peace and security after the war
C.coordinated efforts in war against Japan
D.None of the above

单项选择题

Overlord is a code name for（）

A.American lend-lease assistance to the Soviet Union
B.the summit conference at Teheran
C.the allied landing at Normandy,France in 1944
D.the North African campaign

单项选择题

American war time objectives were（）

A.the total defeat of Axis powers
B.the establishment of a postwar world order under American leadership
C.coordination of war efforts of the Soviet Union,Britain and the United States
D.Both A and B