单项选择题

English has undergone dramatic periods. The period of ______ is roughly from 449 to 1100.

A．Ancient English
B．Old English
C．Middle English
D．Modern English
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单项选择题
If the hypothesis stated at the end of the passage is true, it can be inferred that the crystalline proteins in the lenses of people with cataracts ______.
A．have increased elasticity
B．do not respond to enzymatic glycosylation
C．are at least several months old
D．respond more acutely than other proteins to changes in moisture levels
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.
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