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【单选题】
只用一种试剂就能将甲苯、己烯、四氯化碳、碘化钾溶液、亚硫酸、苯酚溶液区别开，该试剂是A.
KMnO 4 溶液
B.
碘水
C.
溴水
D.
FeC1 3 溶液
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反馈参考答案：
举一反三
【单选题】___they visited the Science Museum, they showed great interest in
A.
erything they saw.
B.
r the first time
C.
The first time
D.
For the first time
E.
At first
F.
Until
【简答题】激素间的相互作用有 、 、 、 。
【单选题】They showed great interest in everything they saw they visited the farm．
A.
for the first time
B.
at the first time
C.
at first
D.
the first time
【单选题】We contacted our customers and they showed great interest because there is a growing().
A.
supply
B.
demand
C.
desire
D.
want
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