.

　　A．introduce the role of bacteria in children’s weight

　　B．analyze the influence of obesity on kids

　　C．give advice on how to lose weight quickly

　　D．explain the function of bacteria in foods

　　答案　A

　　解析　写作意图题。根据文章主题段第一段最后一句“But would you ever have imagined there might be a connection between the bacteria that lived in your guts(内脏) when you were a baby and the chance that you would become overweight？”可知本文主要讲述的是细菌在儿童体重问题上的作用。故A正确。

　　B

　　Windows 8，apart from Windows 95，is the biggest surprise and the only version of Microsoft’s operating system that has been changed from the core(核心) when compared to its former one.However，a recent study has shown that under 20% of business owners would be willing to upgrade to the new version of Windows.The reason for this remains to be discussed and debated，and we will try to throw light on this research by providing you with some of the most common advantages and disadvantages of Windows 8.

　　Generally speaking，there are a great number of plus sides related to upgrading from Windows 7 to Windows 8.

　　Speed—This is the biggest advantage to mention.Boot time has been reported to be up to nine times shorter than that with Windows 7.

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