______ for its own sake is so admired that we find ourselves paying respectful attention not only to channel swimmers but also to people who can dance without stopping for the longest period of time.
A.
Skill
B.
Longevity
C.
Endurance
D.
Bravery
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参考答案:
举一反三
【简答题】在化学实验中,常常依据反应伴随的现象来确定反应是否发生.请按要求写出化学方程式. (1)反应中伴有发光、放热现象 ; (2)加热某种固体(或固体混合物),反应后固体质量减小 ; (3)根据下表写出有沉淀生成的复分解反应 . NO 3 ﹣ SO 4 2 ﹣ OH ﹣ K + 溶 溶 溶 Na + 溶 溶 溶 Cu 2+ 溶 溶 不溶