单项选择题

What causes the tension that draws water up a plant

A．Humidity
B．Plant growth
C．Root pressure
D．Evaporation
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单项选择题
The welcome development mentioned in lines the 1st sentence of the 2nd paragraph is an increase in
A．interest in food safety and nutrition among North Americans
B．the nutritional quality of the typical North American diet
C．the amount of healthy food grown in North America
D．the number of consumers in North America
单项选择题
According to the last paragraph, consumers who believe that organic foods are better than conventionally grown foods are often
A．careless
B．mistaken
C．thrifty
D．wealthy
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