单项选择题

People might be seriously ill if the cells in their body ______.

A．grow without being instructed
B．die regularly
C．fail to follow people's instructions
D．develop in the human body
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单项选择题
The underlined word they ( paragraph 5 ) refers to ______.
A．cell deaths
B．diseases
C．instructions
D．cells
单项选择题
What is the subject discussed in the text
A．The theory of programmed cell deaths.
B．A great scientist-Sir John Sulston.
C．The programmed human life.
D．Dangerous diseases.
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