单项选择题

The main idea of the text is_____.

A．the Dromaeosanr's skeleton was found
B．fossil dinosaur reveals body covered in feathers
C．modern birds evolved from dinosaurs
D．a recent new invention

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单项选择题

What was the most important reason for the U. S. government to stop the Vietnam War and withdraw the troops

A．The economy.
B．The expenses.
C．The lasting time was too long.
D．The antiwar movements both inside and outside the country.

单项选择题

From the text we can deduce that modern birds evolved from dinosaurs _____.

A．is approaching solution
B．remains a debate
C．is apparent
D．is impending