单项选择题

What is the photosphere

A．Area in the sun where atoms break down and build up.
B．Area of the sun which sends out radio waves.
C．Part of the sun we usually see.
D．Layer of gas which forms the corona.
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单项选择题
What happened when Nick was travelling together with some university teachers
A．They saw serious air pollution.
B．The university teachers threw bottles out of the car windows.
C．The university teachers set good examples for young students in environmental protection.
D．They helped clean the countryside.
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