题目内容
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A. Larry has some questions before the quiz.
B. Larry wants to know more about Hawaii.
C. Larry is concerned about his grade on the last quiz.
D. Larry is asking for help because he missed the lecture.
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A. To make them visible to observers.
B. To put them to sleep.
C. To simulate natural daylight.
D. To allow them to see clearly.
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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.