单项选择题
A．transforming poisoned rain B．consulting infrared scanning experts C．resorting to spot-spraying D．detecting crop problems at an early date
A．compared with other hospitals nurses at Beth Israel Hospital are more patient B．in most hospitals patient care is inadequate from the professional point of view C．in most hospitals nurses get low salaries D．compared with other hospitals, nurses have to work longer hours at Beth Israel Hospital.
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.