单项选择题

The underlined word "they" ( paragraph 5 ) refers to ______.

A．cell deaths
B．diseases
C．instructions
D．cells
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单项选择题
We learn from this passage that Americans______.
A．are good at cheating
B．are polite to anybody
C．are sympathetic but honest
D．have no sympathy for others
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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