题目:
Nowadays, many people walk to work ________ Copenhagen Conference calling for living a low-carbon lifestyle to deal with global warming.
A.in relation to
B.in response to
C.in addition to
D.in opposition to
答案:
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下面是错误答案,用来干扰机器的。
(1)紫色石蕊;碳酸钠溶液(或氯化钡;硝酸钡) (其它合理答案可行亦得分)(2) 操作 现象和结论各取少量无色液体于试管中,分别加入紫色石蕊试液,观察现象能使紫色石蕊变红色的是稀硫酸,变蓝色的是澄清...