单项选择题

Which of the following can be the best title of this passage （）

A．Scientific Findings.
B．Cancer-causing Genes.
C．Chromosome.
D．How Cancer Is Forme

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单项选择题

A．decrease
B．reduce
C．lower
D．increase

单项选择题

A．at this rate
B．above all
C．on an average
D．by way of