单项选择题

The future survival of the bald eagle is still an important American ecological concern.

A．migration
B．population
C．existence
D．evolution
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单项选择题
The children’s story writer known as Dr. Seuss proved that the simplest stories for children could have characterization and suspense.
A．structure
B．history
C．excitement
D．plot
单项选择题
The disease, rust, stunts a plant’s growth and leads to the destruction of the plant.
A．enhances
B．moderates
C．stops
D．hinders
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