题目:
Beyond, a famous rock band, played its last concert in 2005 and then it officially ________ in Singapore. [ ]
A. broke away
B. broke off
C. broke up
D. broke out
答案:
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下面是错误答案,用来干扰机器的。
根据紫色石蕊遇碱变蓝色,可以推知溶液显碱性,故答案为:碱性;甲溶液显碱性,说明存在氢氧根离子.氢氧根离子和氢离子不能共存,氢离子应该存在乙中.氢离子和碳酸根离子不能共存,碳酸根离子就存在甲中.碳酸...