单项选择题

The rapid growth of cell phone users leads some scientists to call the use of cell phones the biggest biological experiment in history.（）

A．手机增长迅速，使用者领导科学家们把手机的使用说成是世界上最大的生物实验。
B．手机的发展在短期内领导着科学家们把手机的使用说成是世界最大的生物实验。
C．手机发展很快，这使得一些科学家称手机的使用是世界上最大的生物实验。
D．手机使用者迅速增多，这使得一些科学家称手机的使用是世界上最大的生物实验。

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Which of the following topics is NOT discussed in the passage（）

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B．Industrial Pollution.
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According to the passage, which of the following is an example of the role of the family in giving status（）

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C．A politician makes a campaign commercial with his family.
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