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 compare different levels of proteins.
D．to find out ways to protect aging brain cells.

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单项选择题

The result of the researches so far may help, as asserted by one of the researchers,

A．to prevent cardiovascular disease and cancer.
B．to understand the processes that lead to cell death.
C．to improve our memories.
D．to do what we think is right.

单项选择题

Rosamond felt unhappy without any ______ of his project at the meeting,

A．clue
B．hint
C．comment
D．mention