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单项选择题Apples are used ______.

A．in order to convince the reader that fruit has no intellect
B．to illustrate the subject of the passage
C．to give color to the story
D．to show how foolish logic is

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.