问题
选择题
下列关于铁的描述中，不正确的是 （ ）
A．在FeSO4中滴入KSCN溶液，溶液显红色
B．铁位于元素周期表中第4周期Ⅷ族
C．在化合物中，铁元素常呈现为+2、+3价
D．通常情况下，铁丝在氯气里燃烧时生成FeCl3
答案
答案：A
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下列关于铁的描述中，不正确的是 （ ）
A．在FeSO4中滴入KSCN溶液，溶液显红色
B．铁位于元素周期表中第4周期Ⅷ族
C．在化合物中，铁元素常呈现为+2、+3价
D．通常情况下，铁丝在氯气里燃烧时生成FeCl3
答案：A
| 完形填空。 | |||
| In many big cities, there are usually more than one underground line (地铁线). The fastest way 1 in a city is by subway. How to travel by subway? Do you know? Here is some information 2 before you travel by subway. First, you should 3 the right line. If you don't, you will have to 4 and take another one. Second, you need some coins 5 your ticket, because 6 the machines which sell tickets only accept coins. Coins can be changed next to the ticket machines. Or you can go to the ticket office 7 some. 8 you have a prepaid card, you can just go ahead. After you have bought the 9 , you should wait for your subway outside the yellow line. You 10 walk too close to the yellow line. It's dangerous. | |||
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