题目

The birthday party started with a song of Happy Birthday to You, and ended up ____ the singing of Auld Lang Syne. A. with   B. to       C. in     D. at   答案:Aend up with意为“以…结束”。下列物质中,含有非极性共价键的离子化合物是A.Na2O2B.NaOHC.H2O2D.NH3·H2O
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