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D
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单项选择题
A．In order to elevate their nests.B．In order to live more comfortably.C．In order to avoid predators.D．In order to make incubation easier.
A．In order to elevate their nests.
B．In order to live more comfortably.
C．In order to avoid predators.
D．In order to make incubation easier.
单项选择题
A．Interview some high school students.B．Finish their chemistry experiment.C．Write their lab reports.D．Find our professor Smith’s schedule.
A．Interview some high school students.
B．Finish their chemistry experiment.
C．Write their lab reports.
D．Find our professor Smith’s schedule.
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