单项选择题

What is true of learned words

A．They are learned from lips of our mother.
B．Most people use these words in their daily conversation.
C．Their meanings are known to common people.
D．We learn these words from books, lectures or formal conversation.

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单项选择题

The establishment of the National Park was to ______.

A．stop any mining in the region
B．protect the rock art
C．honor the discovery of the rock art
D．attract tourists from all over the world

单项选择题

George Washington's birthday was first celebrated ______.

A．before the War of Independence
B．after he died
C．after he became the President of the United States
D．during the War of Independence