单项选择题

Warning: Poisonous! If accidentally swallowed, ()vomiting at once and seek medical attention.

A. deduce
B. generate
C. engage
D. induce

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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.
单项选择题
What are the most damaging emissions()

A. Ultrafine particles.
B. Gases.
C. Particles produced by gasoline engines.
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