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【单选题】
某化学兴趣小组欲研究H 2 SO 4 、NaCl、KCl、Na 2 CO 3 、FeCl 3 、NaOH的性质，对于如何研究，他们设计了两种研究方案： 方案1：将它们按照酸、碱、盐分类，然后分别溶于水得到溶液，进行实验． 方案2：将它们按照钠盐、钾盐、铁盐和其他化合物分类，然后分别溶于水得到溶液，进行实验． 下列说法正确的是（ ）A.
按照方案1属于碱的有Na 2 CO 3 、NaOH
B.
按照方案2属于钠盐的有NaCl、Na 2 CO 3 、NaOH
C.
方案1中的碱与方案2中的铁盐反应可得到一种红褐色胶体
D.
设计方案2的同学取某种溶液，在其中加入上述溶液中的钾盐溶液有白色沉淀产生，加入稀硝酸沉淀不消失，则该溶液中一定含有Ag +
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【多选题】下列有关银行汇票的陈述中,正确的有( )。
A.
填明“现金”字样的银行汇票可以提取现金
B.
填明“现金”字样的银行汇票可以挂失止付
C.
商业承兑汇票可以背书转让
D.
银行承兑汇票不可以背书转让
【多选题】下列有关银行汇票的陈述中,正确的有( )。
A.
填明“现金”字样的银行汇票可以提取现金
B.
填明“现金”字样的银行汇票可以挂失止付
C.
填明“现金”字样的银行汇票不可以背书转让
D.
填明“现金”字样的银行汇票可以背书转让
【单选题】An expert on literature himself must be a good writer, just as an art historian has to be a good painter.
A.
Y
B.
N
C.
NG
【判断题】Pitkin Enterprises produces animal figurines for children and young adults. For children, it makes hard-to-break figurines that are promoted and distributed in the same manner as the delicate, porcela...
A.
正确
B.
错误
【简答题】The teaching of writing has gotten mixed together with the study of literature because of ______.
【简答题】A．She has to read a lot of literature books. B．She has failed to meet the deadline for her reading assignment again. C．The Eastern Literature books are too difficult to understand. D．She feels regretf...
【单选题】Roy Pitkin would most probably agree that
A.
it is necessary to question the nationwide food fortification.
B.
more researches should be conducted before any conclusion is reached.
C.
this mouse study can prove nothing because of differences in species.
D.
it is badly needed to review folic acid's health effects.
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