单项选择题

A．They found ways to speed up the reproduction of bald eagles.
B．They developed new types of feed for baby bald eagles.
C．They explored new ways to hatch baby bald eagles.
D．They brought in bald eagles from Canada.
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单项选择题
A．She was invited only for the weekend.B．The weather was too hot.C．She had an appointment.D．She had schoolwork to do.
A．She was invited only for the weekend.
B．The weather was too hot.
C．She had an appointment.
D．She had schoolwork to do.
单项选择题
A．A vacation trip to Yellowstone Park.B．A lecture by a visiting professor.C．Her biology thesis.D．A research project.
A．A vacation trip to Yellowstone Park.
B．A lecture by a visiting professor.
C．Her biology thesis.
D．A research project.
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