单项选择题

The renowned American linguist N. Chomsky in the late 1950’s proposed the distinction between ______.

A. competence and performance
B. langue and parole
C. synchronic and diachronic
D. signified and signifier
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单项选择题
It can be inferred from the passage that ______.
A．futures contractors have made profits out of price surges
B．Americans haven’t learned to think realistically about oil
C．greedy oil companies have conspired to raise oil prices
D．hydrogen-powered cars would have better mileage
单项选择题
When one is to register with the police, he has to take the following EXCEPT ______.
A．25 pounds
B．passport
C．two passport-sized photographs
D．the form Owl
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