单项选择题

According to the passage, which of the following is characteristic of enzymatic glyeosylation 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.
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单项选择题
Which of the following best describes the function of the third paragraph of the passage
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B．It explains a problem that the researchers mentioned in the second paragraph has yet to solve.
C．It evaluates the research discoveries described in the previous paragraph.
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