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【参考答案】

convenience
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单项选择题
A．Realistic and valuable.B．Idealistic and a waste of time.C．Idealistic but valuable.D．Idealistic but worthless.
A．Realistic and valuable.
B．Idealistic and a waste of time.
C．Idealistic but valuable.
D．Idealistic but worthless.
单项选择题
A．A community of plants.B．A community of animals.C．The study and understanding of plants and animals.D．The interacting physical factors of the environment.
A．A community of plants.
B．A community of animals.
C．The study and understanding of plants and animals.
D．The interacting physical factors of the environment.
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