The tobacco business developed quickly in the 20th century because ______. Among the deaths ______, percent of people die from

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问题 The tobacco business developed quickly in the 20th century because ______.
Among the deaths ______, percent of people die from smoking in the USA.

选项 A、fifty
B、twenty
C、ten
D、fifteen

答案B

解析 第二段倒数第四句指出:Today one out of every five people... dies because of smoking,即有死亡的人中有五分之一(20%)是死于吸烟,因此答案为[B]。
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