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【单选题】
可逆反应H 2 (g)+I 2 (g) 2HI(g)达到平衡时的标志是 [ ]A.
混合气体密度恒定不变
B.
混合气体的颜色不再改变
C.
H 2 、I 2 、HI的浓度相等
D.
I 2 在混合气体中体积分数不变
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举一反三
【单选题】The discovery of dinosaur fossil sites in Bolivia is exciting because of the following reasons EXCEPT that
A.
they are found in a continent other than Asia and North Continent.
B.
the largest dinosaurs in the world are found in this discovery.
C.
there are some unknown species of dinosaurs found this time.
D.
the dinosaurs were believed to be some of the last ones on earth.
【单选题】The word other in Paragraph 3 refers to ______.
A.
areas such as Peru and Brazil
B.
Argentina and Brazil
C.
Brazil, Chile, and other areas
D.
Argentina and Peru
【单选题】The passage is mostly about______.
A.
avalanches.
B.
glaciers.
C.
Peru.
D.
mountains.
【简答题】Compared with their displaced counterparts in Peru, the situation of the internally displaced persons in Colombia is ______.
【单选题】The discovery of dinosaur fossil sites in Bolivia is exciting because of the following reasons EXCEPT ______.
A.
they are found in continent other than Asia and North Continent
B.
the largest dinosaurs in the world are found in this discovery
C.
there are some unknown species of dinosaurs found this time
D.
the dinosaurs were believed to be some of the last ones on earth
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