11．A.fun

　　B．luck

　　C．success

　　D．advantage

　　答案　A

　　解析　根据句中“search the Internet”和常识可推断，作者上网时玩得很开心。

　　12．A.excitements

　　B．negatives

　　C．dangers

　　D．terms

　　答案　B

　　解析　根据上文内容可知，用电脑做笔记的缺点比优点多。

　　B

　　Could autism(孤独症) be caused by low levels of vitamin D？That’s a new idea，started from the large number of autism cases among children of Somali

　　13

　　living in Sweden and Minnesota.

　　The mothers and young children are exposed to much less sunshine in their

　　14

　　homes than they were back in Somalia.Lighter­skinned people make

　　15

　　vitamin D than dark­skinned people do when exposed to sunshine，so it’s easy to

　　16

　　that the Somalis are getting

　　17

　　little vitamin D．And because most of the Somali immigrants are Muslim，they cover themselves when going outside，reducing their sun exposure even more.But there’s as yet no clear

　　18

　　with autism.

　　Scientists are just starting to research whether vitamin D could play a role in autism.Their work includes

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