A. are energy efficient
B. should only be used as replacement windows
C. should only be used in new additions to homes
D. will lower your heating costs by 50%
A
Đáp án A
Thông tin trong bài: "Windows provide another opportunity to cut your energy costs. Caulk old windows that might be leaky to prevent drafts, and choose double-paned windows if you're building an addition or replacing old windows.
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