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

In his example the author tells his readers that （）

A．it is important to build up one’s physical capacity
B．it is no good having much physical training
C．it is more important to know one’s capacity than to win the race
D．it is important to have physical training while one trains his mind

单项选择题

In order to apply pesticide spraying precisely, we can use infrared scanning to （）

A．locate the problem areas
B．drew a color-coded map
C．measure the size of the affected area
D．estimate the damage to the crops