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【单选题】
下图是锌和铜形成的原电池，某实验兴趣小组做完实验后,在读书卡片上写下了一些记录，其中描述合理的是 [ ] 卡片:NO:28 Date:2012.3.22 实验后的记录: ①Zn为阳极,Cu为阴极 ②H + 向负极移动 ③电子流动方向Zn→Cu ④Cu极有H 2 产生 ⑤若有1 mol电子流过导线,则产生H 2 为0.5 mol ⑥正极电子反应式:Zn-2e-==Zn 2+A.
①②③
B.
③④⑤
C.
④⑤⑥
D.
②③④
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举一反三
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A.
the act of trying to do or achieve sth
B.
the action of kicking the ball
C.
a scene in a film
D.
fire a gun
【单选题】Which country is the largest coffee producer?
A.
Colombia
B.
Brazil
C.
Ethiopia.
D.
Egypt
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A.
Nanjing
B.
Shanghai
C.
Tianjing
D.
Shantou
【单选题】__ is the largest city and the chief port of the United States.
A.
Washington D．C．
B.
Los Angeles
C.
San Francisco
D.
New York City
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