题目内容

The Backbone of North America refers to the ____.

Appalachian Mountains
B. Rocky Mountains
Cascade Mountains
D. Nevada Mountains

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Which of the following city has the lowest crime rate?

A. Chicago
B. New York
C. Philadelphia
Detroit

The City of Big Shoulders refers to _____.

A. New York
B. Los Angeles
C. Houston
D. Chicago

Which of the following architecture are not located in NY?

A. Statue of Liberty
B. Golden Gate
C. Empire Building
D. Brooklyn Bridge

多谐振荡器可产生()。

A. 正弦波
B. 矩形波
C. 三角波
D. 锯齿波