单项选择题

How did the man get first-hand ideas on his subject()

A.By travelling to countries in Asia and Africa.
B. By doing questionnaires.
C. By doing research into private companies.

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What are the most damaging emissions()

A. Ultrafine particles.
B. Gases.
C. Particles produced by gasoline engines.
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What will the woman do next()

A. Visit the pet motel.
B. Write a review.
C. Look for some information.
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