单项选择题

Why does Catherine say people themselves produce harmful vapors into the indoor air

A．People shed more than any other animal indoors.
B．People do not keep their room tidy.
C．People’s skin flakes are small enough to float in the air and pollute the indoor air.
D．The furniture people buy is in bad quality.
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单项选择题
According to the passage, which of the following is characteristic of enzymatic glycosylation of proteins
A．AGE’s are formed after a period of months or years.
B．Proteins affected by the process are made unstable.
C．Glucose attachment impairs and stiffens tissues.
D．Glucose is attached to proteins for specific purposes.
单项选择题
Why does the man bring his wife back
A．He has suggested some new arguments to her.
B．He is very anxious to sell the house.
C．He is afraid she might have offended a potential buyer.
D．He wants her to continue to negotiate on his behalf.
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