题目：
The colors on the national flags can be ______ differently in different culture, but they have one thing in common, that is, ______of the colours was carefully chosen.
A．translated; every
B．explained either
C．represented ; all
D．interpreted; each
答案：
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答案：B题目分析：A中向碳酸钠和碳酸钙中加盐酸均能产生气泡，错误；盐酸、氯化钠溶液、氢氧化钙溶液分别呈酸性、中性和碱性，能通过测PH鉴别，盐酸与碳酸钠反应生成气体，Ca(OH)2溶液与碳酸钠反应生成沉淀，B正...
