11B【解析】由题意结合均值、方差的定义可知,数据x1+s,x2+s,x3+s的均值、方差分别为12=2故选B.

短文改错:It is hard of me to do others a favor. I live in A remote area, I often spend many days without see any-e. But I can volunteer at the local animal shelter. I had worked with a very young cat, who is serious sickfor over a week. About a month ago, she wasfound on the side of a road. Every day, I feed her onfood or water. help her to take medicine and worry about her. I have made a decision which I adopt her aftershe recovers. I believe they will live together in the future years, accompanying each other. So I am not surewho is most blessed between her and me7l.of-for【解析】考查介词。根据前面的形容词hard可知,这里是描述事物,需要用for。只有描述人的时候采用of,例如nice等72. remote前加a【解析】考查冠词。可数名词前需用冠词,73.sec- seeing【解析】考查非谓语动词。介词后接动词的动名词形式,74. had-have【解析】考查动词时态。根据上下文的时态及大意可知,这里要用现在完成时。75. senous- seriously【解析】考查词性运用。修饰形容词要用副词形式76.去掉 found前的 being【解析】考查动词时态语态。根据句意,此处应用一般过去时的被动语态,故 being是多余的。77.or-and【解析】考查连词。根据句意,此处应为并列关系78. which-that【解析】考查名词性从句。此处是 decision的同位语从句,要用that引导79.they-we【解析】考查人称代词。根据句意,此处应该是指“我们”。80.most-more【解析】考查比较级。此处是两者之间的比较,故用more而不用most

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