单项选择题

According to the woman, what causes most of the damage to the air

A．Industrial sources.
B．Automobiles.
C．Nitrogen sources.
D．Natural activities.
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单项选择题
What does the man think of his writing
A．Writing will not be easy.
B．Writing will be less difficult.
C．Writing has been boring.
D．Writing has been enjoyable.
单项选择题
The temperature at Ann Arbor Airport was ________degrees Fahrenheit.
A．79
B．75
C．74
D．73
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