单项选择题

The "chronic reference doses" (in boldface in Paragraph 3) refer to ______.

A．the safe levels of pesticide exposure
B．the amount of fruits one can safely eat
C．one's digestive capacity for fruits
D．health values of fruits and vegetables

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热门试题

单项选择题

In the Alar apple scare, many Americans were frightened because ______.

A．scientists warned that apples were dangerous
B．many school children became iii after eating apples
C．it was reported that apples were harmful to health
D．apples were discovered to have too much pesticide

单项选择题

The wanting message about the Alar apple was given ______.

A．by Consumers Union
B．by a health center
C．through an news agency
D．through the government