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【单选题】
5淀粉溶液是一种胶体，并且淀粉遇到碘单质可以出现明显的蓝色特征。现将淀粉和稀Na 2 SO 4 溶液混合，装在半透膜袋中，浸泡在盛蒸馏水的烧杯内，过一段时间后，取烧杯中液体进行实验，能证明半透膜完好无损的是 [ ]A.
加入BaCl 2 溶液产生白色沉淀
B.
加入碘水不变蓝
C.
加入BaCl 2 溶液没有白色沉淀产生
D.
加入碘水变蓝
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举一反三
【单选题】I felt _____ during those dark days.
A.
hopeful
B.
relaxing
C.
hopelessly
D.
hopeless
【单选题】I felt uncomfortable there was a long silence during the meal.
A.
and
B.
but
C.
because
D.
so
【单选题】I felt very _______ during my first hours in the country
A.
alien
B.
foreig n
C.
vague
D.
queer
【单选题】下面几种溶液: 1 0.1mol·L -1 Al 2 (SO 4 ) 3 2 0.2mol·L -1 ZnSO 4 3 0.3mol·L -1 NaCl 4 0.3 mol·L -1 蔗糖 。按溶液的 渗透压 由高到低排列,顺序正确的是( )
A.
①②③④
B.
③④②①
C.
④②①③
D.
④②③①
E.
③①②④
【单选题】I visited quite a few relations and felt _____ tired during the Spring Festival. [ ]
A.
a bit of
B.
a lot of
C.
a bit
D.
a few
【单选题】I felt uncomfortable _________ there was a long silence during the meal.
A.
and
B.
because
C.
but
D.
so
相关题目：
【单选题】I felt very _______ during my first hours in the country
A.
alien
B.
foreig n
C.
vague
D.
queer
参考解析：
知识点：
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