单项选择题

The rats fed unrestricted diets do NOT ______

A．have one preventing-aging protein increased
B．have their cell death increased or doubled
C．have their DNA fragmentation doubled
D．have the levels of proteins increased

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单项选择题

Which of the following statements is true, according to the passage

A．Scientists make no progress in the researches.
B．Researchers have made a great breakthrough.
C．More researches are to be made in the field.
D．The more proteins the less calories the better.

单项选择题

The main purpose of these researchers is ______

A．to help to destroy old cells and boost new ones
B．to alter the natural process known as apoptosis
C．to find out ways to protect aging brain cells
D．to compare different levels of proteins