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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单项选择题
Which of the following is a form of wildlife s extermination
A．Overhunting animals.
B．Destruction of animal habitat.
C．Excessive use of pesticides.
D．All of the above.
单项选择题
What can we see when we photograph the sun
A．A huge glowing ball of gas.
B．X-rays and ultra-violet light.
C．Lots of dark spots on the surface of the sun.
D．Atomic particles.
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