单项选择题

If the hypothesis stated at the end of the passage is true, it can be inferred that the crystallin 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

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单项选择题According to the passage, which of the following statements is true of Amadori products in proteins

A．They are created through enzymatic glycosylation.
B．They are composed entirely of glucose molecules.
C．They are derived from Schiff bases.
D．They are derived from AGE's.

单项选择题With which of the following statements concerning the stiffening of aging tissues would the author most likely agree

A．It is caused to a large degree by an increased rate of cell multiplication.
B．It paradoxically both helps and hinders the longevity of proteins in the human body.
C．It can be counteracted in part by increased ingestion of glucose-free foods.
D．It probably involves the nonenzymatic glycosylation of proteins.

单项选择题The writer is probably _______.

A．French
B．English
C．American
D．Italian

单项选择题The author has the approach of a (n) _______.

A．scientist
B．artist
C．novelist
D．economist

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