单项选择题

A．They have difficulty identifying these cells.
B．They aren’’t sure how these cells work.
C．They’’ve learned how to reproduce these cells.
D．They’’ve found similar cells in other species.
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单项选择题
A．They brought in bald eagles from Canada.B．They explored new ways to hatch baby bald eagles.C．They developed new types of feed for baby bald eagles.D．They found ways to speed up the reproduction of bald eagles.
A．They brought in bald eagles from Canada.
B．They explored new ways to hatch baby bald eagles.
C．They developed new types of feed for baby bald eagles.
D．They found ways to speed up the reproduction of bald eagles.
单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
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