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【简答题】
Nanoparticles that are naturally occurring (e.g. volcanic ash or soot from forest fires) or are the incidental byproducts of combustion processes (e.g. welding, diesel engines) are usually physically and chemically heterogeneous, and are often termed ____________________.
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【单选题】What does the doctor think of the man's job?
A.
It's hard for him.
B.
It's easy for most people.
C.
Nobody will dislike it.