生物个体、种群和群落都是经典生态学的研究对象。（）
A. 正确
B. 错误
What kind of birds came to the bird houses？
A. Soon robins came to the bird houses.
B. Soon bluebirds built nests in the bird houses.
C. Soon purple martins built nests in the bird houses.
D. Soon baby birds built nests in the bird houses.
休眠是生物抵御不利环境的生理机制。（）
A. 正确
B. 错误
Harry and Kate and their sons would like ______, which is quiet even in the busy summer season.
A. a holiday working on a Kibbutz in Israel
B. a holiday visiting ancient cities by coach in Italy
C. a holiday hotel on a lonely beach on the Caribbean island
D. a holiday apartment in the fishing port in Mallorca
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