填空题

Any pill used widely by healthy people to ’improve memory, would have to be ______.

【参考答案】

extremely safe
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填空题
Dr. Tully created genetically engineered fruit flies that he said had ______.
单项选择题
A．Apple pies.B．Chocolate cakes.C．Ice cream.D．Nothing:
A．Apple pies.
B．Chocolate cakes.
C．Ice cream.
D．Nothing:
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