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【单选题】
中国有八大古都,其中( )有 4 个。A.
湖南
B.
江苏
C.
陕西
D.
河南
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皮皮学刷刷变学霸
举一反三
【简答题】66666666666
【单选题】Because of climate change, the ice that polar bears depend on for survival .
A.
are slowly disappearing
B.
is slowly disappearing
C.
are slowly disappeared
D.
have slowly disappeared
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored, in a cold place.
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored in a cold place.
【单选题】下列基团从小到大排列正确的是
A.
烷基、醚基、酯基、酮基
B.
烷基、酯基、醚基、酮基
C.
烷基、酮基、醚基、酯基
D.
烷基、酯基、醚基、烯基
E.
烷基、酮基、酯基、醚基
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