单项选择题

A．His own room.
B．A lot of friends.
C．A babysister.
D．A lot of toys.
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单项选择题
A．The reproductive cycle of barnacles.B．A new source of protein.C．Types of sea animals.D．The adhesive quality of barnacles.
A．The reproductive cycle of barnacles.
B．A new source of protein.
C．Types of sea animals.
D．The adhesive quality of barnacles.
填空题
Dr. Tully created genetically engineered fruit flies that he said had ______.
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