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单项选择题

Ronald Kahn and his colleagues can make mice live longer by

A．offering them less food.
B．giving them a balanced diet.
C．disrupting the specific genes in their fat cells.
D．preventing them growing larger.
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单项选择题The average modified mouse lived

A．3 years.
B．753 days.
C．More than 3 years.
D．887 days.

单项选择题What can be inferred from the passage about the route to long life

A．It remains to be studied.
B．It has already been discovered.
C．Eating more leads to long life.
D．Eating less leads to long life.