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【简答题】
小红同学为探究二氧化碳与水反应的生成物，做了如下实验： 将水倒入集满二氧化碳且质地较软的塑料瓶中，立即旋紧瓶盖，振荡；再取塑料瓶中液体少许，向试管中滴加紫色石蕊试液（如图），观察到紫色石蕊试液变成了红色．为了探究是什么物质使紫色石蕊变红了，小红同学作了大胆猜想，并用石蕊溶液染成紫色的干燥的小花设计了下列四个实验方案来验证自己的猜想（如图）． 实验方案（A）   实验方案（B）   实验方案（C）     实验方案（D） 直接喷稀醋酸    直接喷水    直接放入二氧化碳中     喷水后放入二氧化碳中 （1）请和小红同学一起完成下表． 猜想 实验方案 实验现象 结论 可能是CO 2 使石蕊变红 C 紫色小花不变色 B 紫色小花不变色 猜想错误 可能是CO 2 和水发生反应的生成物使石蕊变红 猜想正确 （2）小红同学做了一个对比实验来确定CO 2 与水反应生成具有酸性的物质，此对比实验方案是______（填上图中的实验方案番号）．
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【单选题】Sharks are fish. There are about 350 species of sharks. The smallest sharks are only 12. 5 cm long. The largest, the whale shark, is the world's largest fish. It grows to about 1Sm long. Sharks are di...
A.
humans' friends
B.
man's enemies
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not the same as other fish
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【判断题】由于二氧化硫的漂白作用,能使高锰酸钾溶液褪色。
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【判断题】由于二氧化硫的漂白作用,能使高锰酸钾溶液褪色。
A.
正确
B.
错误
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【单选题】What is the use of a seisograph?
A.
It is used to record the strength of an earthquake or seaquake.
B.
It is used to record the direction of an earthquake or seaquake.
C.
It is used to record the length of time of an earthquake or seaquake.
D.
It is used to predict when a tidal wave will hit land.
查看完整题目与答案
【判断题】由于二氧化硫的漂白作用,能使高锰酸钾溶液褪色。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What contributes most to the overfishing of sharks is ______,
A.
the sharks accidentally captured by tuna fishers
B.
the rough few decades that sharks have suffered
C.
the ever-increasing demand for their fins and meat
D.
the millions of sharks killed deliberately each year
查看完整题目与答案
【单选题】What is the use of a seismograph?
A.
It is used to record the strength of an earthquake or seaquake.
B.
It is used to record the direction of an earthquake or seaquake.
C.
It is used to reocrd the length of time of an earthquake or seaquake.
D.
It is used to predict when a tidal wave will hit land.
查看完整题目与答案
【单选题】Sharks use strength to get what they want. They try to win by _______other people.
A.
making up with
B.
compromising
C.
overpowering
D.
competing with
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【简答题】Sharks are among the oldest animals on Earth. There are hundreds of kinds of sharks. Most are about two meters long. The dogfish shark, however, is less than twenty centimeters in length. A shark has ...
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【简答题】对下列各题分别证明 G 为 的逻辑结论。
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相关题目：
【单选题】Sharks are fish. There are about 350 species of sharks. The smallest sharks are only 12. 5 cm long. The largest, the whale shark, is the world's largest fish. It grows to about 1Sm long. Sharks are di...
A.
humans' friends
B.
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C.
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D.
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【判断题】由于二氧化硫的漂白作用,能使高锰酸钾溶液褪色。
A.
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【判断题】由于二氧化硫的漂白作用,能使高锰酸钾溶液褪色。
A.
正确
B.
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【单选题】What is the use of a seisograph?
A.
It is used to record the strength of an earthquake or seaquake.
B.
It is used to record the direction of an earthquake or seaquake.
C.
It is used to record the length of time of an earthquake or seaquake.
D.
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查看完整题目与答案
【判断题】由于二氧化硫的漂白作用,能使高锰酸钾溶液褪色。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What contributes most to the overfishing of sharks is ______,
A.
the sharks accidentally captured by tuna fishers
B.
the rough few decades that sharks have suffered
C.
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D.
the millions of sharks killed deliberately each year
查看完整题目与答案
【单选题】What is the use of a seismograph?
A.
It is used to record the strength of an earthquake or seaquake.
B.
It is used to record the direction of an earthquake or seaquake.
C.
It is used to reocrd the length of time of an earthquake or seaquake.
D.
It is used to predict when a tidal wave will hit land.
查看完整题目与答案
【单选题】Sharks use strength to get what they want. They try to win by _______other people.
A.
making up with
B.
compromising
C.
overpowering
D.
competing with
查看完整题目与答案
【简答题】Sharks are among the oldest animals on Earth. There are hundreds of kinds of sharks. Most are about two meters long. The dogfish shark, however, is less than twenty centimeters in length. A shark has ...
查看完整题目与答案
【简答题】对下列各题分别证明 G 为 的逻辑结论。
查看完整题目与答案