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【单选题】
What effect does excessive positive ions have on some people?
A.
They think they are mad.
B.
They feel very tired.
C.
They become violently sick.
D.
They are too tired to do anything.
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【单选题】My young brother runs____than my old brother
A.
fast
B.
Fastest
C.
faster
【单选题】下列关于原电池的叙述中,正确的是
A.
原电池中,正极就是阳极,负极就是阴极
B.
原电池工作时,在负极上发生氧化反应
C.
原电池工作时,溶液中的阳离子向负极移动
D.
电流从负极沿外电路流向正极
【单选题】My brother runs fast. Look, he _______
A.
runs
B.
running
C.
is running
D.
are running
【单选题】下列关于原电池的叙述中,正确的是
A.
原电池中,正极就是阳极,负极就是阴极
B.
形成原电池时,在负极上发生氧化反应
C.
原电池工作时,溶液中的阳离C子向负极移动
D.
电子从负极经电解质溶液流向正极
【单选题】人体内最主要的供能物质和最重要的贮能物质分别是 [     ]
A.
蛋白质和糖类
B.
蛋白质和脂肪
C.
糖类和脂肪
D.
脂肪和糖类
【简答题】根据句意及首字母提示补全单词 1. My brother runs very fast. He wants to be an a__________ when he grows up. 2. Their fathers had to work on building sites to make a l__________. 3. After hard work, the boy finally g...
【简答题】My brother runs________(快地) and he is good at running.
【单选题】My young brother runs____ than my old brother.
A.
fast
B.
fastest
C.
faster
【简答题】1 电池中正极、负极、阴极、阳极的分别是如何命名的?为什么说在原电池中负极就是阳极,正极就是阴极?对电解池来说,负极就是阴极、正极就是阳极?
【判断题】原电池的正极就是阳极,负极就是阴极。
A.
正确
B.
错误
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