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That pair of shoes he liked was ______.
A. too expensive
B. quite cheap
C. not sold
Wang decides to take courses and pass exams.
A. True
B. Fasle
Jim has a yellow pencil.
A. True
B. False
Private companies have little interest in producing flu vaccines because of______.
A. complicated process, high cost, low profit and high risk
B. shortages of fertilized chicken eggs
C. difficulty in growing live virus
D. fast changing of flu virus
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