关于电力变压器能否转变直流电的电压，下列说法中正确的是（）
A. 变压器可以转变直流电的电压 B．变压器不能转变直流电的电压 C．变压器可以转变直流电的电压，但转变效果不如交流电好 D．以上答案皆不对
B. 变压器可以转变直流电的电压
C. 变压器不能转变直流电的电压
D. 变压器可以转变直流电的电压，但转变效果不如交流电好
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Which of the following food belongs to British traditional food（）
A. paella, Yorkshire pudding
B. Cornish pasties, curry
C. Bread and butter pudding, treacle tart
D. Fish and chips, sushi
Which subject is the compulsory subject to American students（）
A. music
B. English
C. art
D. theater classes
What are needed in your application process except__（）
A. submitting an application for admission
B. submitting two letters of recommendation from teachers, counselors, or advisors
C. demonstrating their English language proficiency scores from TOEFL or GRE
D. submitting SAT or ACT test scores
Which book conveyed the message that slavery was the root of social cruelty（）
A. Common Sense
B. Declaration of Independence
C. Uncle Tom’s Cabin
D. Mayflower Compact
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