单项选择题

A．Because the Americans found they were from Germany.
B．Because people thought they contained dog meat.
C．Because people had to get used to their taste.
D．Because it was too hot to eat right away.
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单项选择题
Since 1939, numerous scientific studies ______.
A．proved smoking causes fatal diseases
B．proved smoking causes life-shorting diseases
C．proved smoking is a health risk
D．had been made to prove whether smoking causes life shorting
填空题
suffering
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