单项选择题

According to the context, the word in "oncogenes" in parA．2 means （）

A. genes that can kill cancer
B. genes that will lead to leukemia
C. viruses that can kill AIDS
D. genes that will lead to cancer

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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
单项选择题
30（）

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