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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