题目内容
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A. Study marsupial mammals.
B. Leave the zoo.
C. Look at the nocturnal animals.
D. Go to the World Down Under exhibit.
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An improved toothbrush.
B. Recent developments in genetics.
C. New uses for bacteria.
D. A means of fighting tooth decay.
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A. They have many side effects.
B. They occur naturally in people's mouths.
C. They attack one type of bacteria.
D. They cause tooth decay.
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A. Plan A includes dinner, but Plan B does not.
B. Plan B is more expensive than Plan A.
C. Plan B includes Sunday dinner, but Plan A does not.
D. Plan A provides for three meals on most days while Plan B provides for only two.
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