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 译文为:为了节省能源,房地产商被鼓励建造能在冬季保暖的房屋。retain保留,保持。attain实现;keep保持;release释放;generate产生。
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