正确答案: B

某气体能使湿润的红色石蕊试纸变蓝，该气体水溶液一定显碱性

题目：下列实验设计和结论相符的是

解析：B【解析】A项，乙醇不可以作为萃取剂，错；B项，石蕊变蓝，则肯定为碱性，正确。C项，若原溶液中含有SO32 －，生成BaSO3，再加入HCl，则与溶液的NO3－ 结合，相当于HNO3，则可以氧化BaSO3至BaSO4，沉淀不溶解，故错；D项，加热时，FeCl3会水解，错。

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举一反三的答案和解析：

[单选题]Why did American city residents want to live in the suburbs after World War Ⅱ?

Because they were richer and needed more space.

[单选题]做下列运动的物体，能当作质点处理的是

旋转中的风力发电机叶片

解析：ABC选项中对所研究的问题,物体各部分的运动情况不一样所以不能看作质点,D可以.

[单选题]Diabeitcrockstar.com was created for _________.

diabetics to communicate

解析：细节理解题。根据a free online community for diabetics and their loved ones—a place where over 1,100 people share personal stories, information, and resources可知A项正确。

[单选题]

B．work C．school D．hospital

school

[多选题]菊科各类花中，( )为非两性花。

假舌状花

漏斗状花

解析：CE

[单选题]

until after

[单选题]To improne the pmlity of our products we uaked for nuggratior a had used the producu.

whacver B．who

[单选题]Amy joined a painting group but didn’t seem to _______, so she left.

fit in

[单选题]天南星有10～19片叶轮生于茎顶。( )

错误