单项选择题

According to the news, how many pilot whales eventually died before they were rescued

A．15.
B．7.
C．8.
D．6.
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单项选择题
Which of the following is NOT among the types of the pollutants the author mentions in the passage
A．Sulfur oxides.
B．Toxic materials.
C．Particulate matter.
D．Carbon monoxid
单项选择题
Which of the following can best served as the title of the passage
A．The Cause of Air Pollution.
B．The Issue of Air Pollution.
C．The Types of Air Pollution.
D．The Prevention of Air Pollution.
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