Chomsky made the distinction between___（）
A. competence and performance
B. comparative linguistics and historical linguistics
C. langue and parole
D. microlinguistics and macrolinguistics
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holds that language originated from people’s imitations of animal cries and other sounds heard in nature（）
A. The pooh-pooh theory
B. The bow-wow theory
C. The divine-source theory
D. The yo-he-ho theory
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
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
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