2012年英语四六级考试于6月16日举行，为了帮助广大考生备考2012年6月英语四六级考试，本站小编整理了2012年6月四级英语考试必备词汇笔记等信息，预祝大家顺利通过英语四六级考试。
48. _C_ one time， Manchester was the home of the most productive cotton mills in the world. [at one time 曾经，一度]
A On B By C At D Of
49. _A_ it or not， his discovery has created a stir in scientific circles.
A Believe B To believe C Believing D Believed
believe it or not 信不信由你。 creat a stir 引起轰动。
50. Mr. Morgan can be very sad _C_， though in public he is extremely cheerful.
A by himself B in person C in private D as individual
in public 在公众面前; in private 私下单独一个人的时候。
关于逗号的一些知识
原则：逗号没有能力连接两个单独的句子。
如何区分短语与句子?一个结构如果有完整的谓语部分就是句子。
何为完整的谓语部分?如果能判断出一个结构的时态就可以称这个结构为完整的谓语部分。
在什么样的情况下一个逗号可以将句子分成两部分，而这两部分都有完整的谓语呢?
1 两个句子中间有连接词连接;
2 这两个句子是主从句关系(主从句之间一定要有句子引导词来引导)。
10. Walter offered us a lift when he was leaving the office， but our work _A_， we declined the offer. [declined v. 婉言谢绝]
A not being finished B not having finished
C had not been finished D was not finished
42. A survey was carrie3d out on the death rate of new-born babies in that region， _D_ were surprising. [survey 调查]
A as results B which results C the results of it D the results of which
51. All flights _D_ because of the snowstorm， many passengers could no nothing but take the train. [having been canceled 这里是独立主格作原因状语]
A had been canceled B have been canceled
C were canceled D having been canceled
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