问答题

Only recently______________________________(科学家才开始意识到咖啡因可能给我们的健康带来的危险)．

【参考答案】

have scientists begun to realize the dangers，caffeine might ......

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单项选择题
A．He was furious with his boss.B．He was always late to work.C．His daughter was sick and that made him late for work.D．He prepared a financial report incorrectly.
A．He was furious with his boss.
B．He was always late to work.
C．His daughter was sick and that made him late for work.
D．He prepared a financial report incorrectly.
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What is the explanation of animal-behavior experts for the clever behavior of pets
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