Why isn't the word "sir" commonly used in Britain
A. Because it sounds too servile and is likely to cause embarrassment.
Because it can only be used in certain occupations.
C. Because it is an impolite word.
D. Because it shows that the speaker is not a well-bred person.
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In contrast to the earlier linguists, modem linguists tend to ______ .
A. attempt to continue the standardization of the language
B. evaluate language practices in terms of current speech rather than standards or proper patterns
C. be more concerned about the improvement of the language than its analysis or history
D. be more aware of the roles of the language usage
The middle class mainly refers to people ______ .
A. who were born as aristocrat
B. who have the right to sit in the House of Lords
C. who speak in many different local accents
D. who are prosperous businessmen or professionals
In cold climates, the wood-frame dwelling, properly built and insulated, ______ warmest type of home.
A. and the
B. the
C. is the
D. where it is the
三相电源绕组△联结时只能输出( )。
A. 相电压
B. 线电压和相电压
C. 线电压
D. 相线对地电压
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