单项选择题

The distinction between competence and performance was made by ______.

A. Halliday
B. Saussure
C. Bloomfield
D. Chomsky
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单项选择题
With regard to its size, the U. S.
A. is the ______ country in the world.A. largest
B. second largest
C. third largest
D. fourth largest
单项选择题
Don Juan was written by ______.
A. Percy Bysshe Shelley
B. John Keats
C. George Gordon Byron
D. William Wordsworth
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