题目内容
（请给出正确答案）
Researchers think______.
A．artificial smells help to improve people's memory
B．the technology to produce artificial smells is in the early stage
C．artificial smells are harmful
D．the production of artificial smells is profitably
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B．N
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A.victims
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A．正确
B．错误
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A．Y
B．N
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A．confirmed
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A．increased
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D．thousands of pictures.
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