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【单选题】
Not all food additives are bad and many of them are used to help preserve freshness, add flavor and protect foods from spoiling. But some people want to avoid food chemicals anyway.A.
substances added to food
B.
substances that is fatty and oily
C.
substances found in natural and organic products
D.
substances making people unable to stop doing something
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【单选题】When writing a complaint letter, we had better use _____ voice to make the statement seem objective.
A.
a ctive
B.
p assive
C.
o ptimistic
D.
p essimistic
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