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[单选题]
The main purpose of the passage is to __________.
A
aexplain how cell phones workbintroduce three types of cell phonescdiscuss the fun of using mobile phonesddescribe the harm of water to cell phones
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试题答案：
B
答案解释：
主旨题。本题难度不大，文章首段就指出要介绍3种手机，因此选B。
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