To conserve energy, estate developers are encouraged to build houses that can retain heat in winter.

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问题 To conserve energy, estate developers are encouraged to build houses that can retain heat in winter.

选项 A、attain
B、keep
C、release
D、generate

答案B

解析 retain的意思是“保留，留下，保持"，与keep意思相近。attain“实现，得到”；release “释放，排放，发行，解脱"；generate“产生，引发”。故选B。

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