单项选择题

Which of the following is not hazardous to our health

A．School.
B．Clean house.
C．The Environmental Protection Agency’s headquarters.
D．None of the above.
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单项选择题
According to the passage, which of the following statements is true of the process that discolors and toughens foods
A．It takes place more slowly than glycosylation in the human body.
B．It requires a higher ratio of glucose to protein than glycosylation requires in the human body.
C．It does not require the aid of enzymes to attach glucose to protein.
D．It proceeds more quickly when the food proteins have a molecular structure similar to that of crystallin proteins.
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