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　　1.单选题

　　【填句补文】Gang Xiao and Ben Schrag at Brown University, visualize the current by measuring subtle(细微的) changes in the magnetic field of an object and ________.

　　A、to shrink it to the size of a desktop computer

　　B、to make it capable of measuring very weak changes in magnetic fields

　　C、as well as revealing microscopic defects in anything from aircraft to banknotes

　　D、converting the information into a color picture showing the density of current at each point

　　正确答案：D

　　答案解析：空格前的by在句中引导两个在句法结构上并列的分词短语：一个是measuring subtle (细微的) changes in the magnetic field of an object;另一个就是converting the information into…，即：通过测量一个物体的磁场内的细微变化和把信息转化成显示每一点电流强度的彩色图片而使电流显现。

　　2.单选题

　　[阅读理解]We find that bright children are rarely held back by mixed-ability teaching. On the contrary， both their knowledge and experience are enriched. We feel that there are many disadvantages in streaming pupils. It does not take into account the fact that children develop at different rates. It can have a bad effect on both the bright and the not-so-bright child. After all， it can be quite discouraging to be at the bottom of the top grade!

　　The author‘s attitude towards “mixed-ability teaching” is ______.

　　A、critical

　　B、questioning

　　C、approving

　　D、objective

　　正确答案：C

　　答案解析：选项A表示作者持“批评的”态度，选项B表示作者持“怀疑的”态度，选项C表示作者持“赞同的”态度，选项D表示作者持“客观的”态度。根据本段内容可以看出作者是持“赞同的”态度，所用的人称代词也是we，因此答案是选项C。如果是持“客观的”态度的话，则人称代词不会用we。

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