单项选择题
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A.He had already paid for the meals when he bought his ticket.
B.He had to pay for every meal he had on board.
C.The meals were served free of charge.
D.He could not have the bill.
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单项选择题
By cloning Missy, Mark Westhusin hopes to ________.
A.study the possibility of cloning humans
B.search for ways to modify its temperament
C.examine the reproductive system of the dog species
D.find out the differences between Missy and its clones
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