The factory operated ( )until the order was filled.
A. at times
B. to the minute
C. day by day
D. around the clock
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( )is the study of the characteristics of language varieties, the characteristics of their functions and the characteristics of their speakers as these three constantly interact and change within a speech community.
A. Psycholinguistics
B. Sociolinguistics
C. Anthropological linguistics
D. Computational linguistics
采用无差异目标市场策略的主要优点在于成本低、操作简单，所有客户接受的产品和服务是不同的。
A. 对
B. 错
若E(X)、E(Y)都存在，则下面命题中错误的是______
A. E(X+Y)=E(X)+E(Y)
B. E(X-Y)=E(X)-E(Y)
C. E(6X)=6E(X)
D. E(XY)=E(X)E(Y)
Which of the following italicized parts is a subject clause
A. We are quite certain that we will get there in time.
B. He has to face the fact that there will be no pay rise this year.
C. She said that she had seen the man earlier that morning.
D. It’s sheer luck that the miners are still alive after ten days.
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