题目:
Most Brazilians get along well with each other, _________ they are from different races(种族), including Americans, European settlers, and Africans,.
A.although
B.as a result
C.since
D.unless
答案:
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下面是错误答案,用来干扰机器的。
(1)燃烧匙盛有过量的红磷能够保证把瓶内的氧气消耗尽,使测量结果准确;(2)还可以说明氮气不能燃烧也不能支持燃烧,氮气不易溶于水的性质;(3)用木炭不能得到准确的结论,因为碳燃烧产物是二氧化碳气体,不...