单项选择题

In 2006, she was elected ______ chairman of the Student Union.

A. an
B. a

C. \
D. the
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单项选择题
The word this in the second sentence of paragraph 2 most probably refers to______.
A. farmers

B. penicillin
C. beef and poultry

D. the fact lhat farmers often give penicillin to beef
单项选择题
A. Worried and frightened. B. Quite unhappy.C. Very relaxed. D. Angry with the professor.
A. Worried and frightened.
B. Quite unhappy.
C. Very relaxed.
D. Angry with the professor.
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