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【单选题】
推理是化学学习中常见的思维方法。下列推理正确的是A.
酸能使紫色石蕊试液变红，二氧化碳也能使紫色石蕊变红，所以二氧化碳是酸
B.
某物质在空气中燃烧后生成二氧化碳和水，则该物质中一定含有氧元素
C.
溶液中滴加氯化钡溶液，产生不溶于稀硝酸的白色沉淀，说明该溶液中可能存在SO 4 2-
D.
溶液中有晶体析出，其溶质的质量减少，所以溶质的质量分数一定减小
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【简答题】绩效考核的功能有哪些？
【单选题】听力原文： Ice dancing developed from ballroom dancing, particularly the waltz, and was very popular in the early 1900s. It requires well-trained, exact footwork conformity with one another's steps and a k...
A.
Ice dancing requires exact footwork and a keen sense of music.
B.
Partner shouldn't be raised too high or jump during ice dancing.
C.
Ice dancing needs conformity with each other and jump.
D.
Partner should be lift higher and the other be on the ice all the times.
【单选题】This is a good piece of music for us to _____. [ ]
A.
dancing
B.
dancing to
C.
dance by
D.
dance to
【简答题】A．Consult her dancing teacher. B．Take a more interesting class. C．Continue her dancing class. D．Improve her dancing skills.
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