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 inferred from what Thomas Jefferson said（）

A．Europe was changing more quickly than America.
B．Europe had greater need of farm machinery than America did.
C．America was finally running out of good farmland.
D．There was a shortage of workers on American farms.

填空题

A.through B.another C.either D.though