单项选择题

Some of the trials were too short to show their long-term effects.（）

A． Right
B． Wrong
C． Not mentioned

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单项选择题
What did the patient do on that particular night（）

A．He squeezed and let go his wife’s hand
B．lie held up one of his fingers
C．He stuck out his tongue
D．All of the above
单项选择题
It is possible to extend lifespan by means of all the following EXCEPT（）

A．dietary intervention
B．genetic alteration
C．exercise
D．aging-related processes
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