下列化学方程式书写正确的是[ ] A．电解水：2H2O2H2↑+O2↑ B．铁丝

发布时间：2017-07-23 08:04 │ 来源：www.tikuol.com

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问题：

下列化学方程式书写正确的是[ ]

A．电解水：2H₂O2H₂↑+O₂↑

B．铁丝在氧气中燃烧：4Fe+3O₂2Fe₂O₃

C．乙醇在空气中燃烧：C₂H₅OH+3O₂2CO₂+3H₂O

D．木炭与氧化铜在高温下反应：2CuO+C2Cu+CO₂

考点：化学反应方程式的书写

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完形填空。

Last year my English class was __1__ for me. First of all, it wasn't easy for me to understand the
teacher when she __2__ to the class. To begin with, she spoke too quickly, and I couldn't __3__ every
word. Later on, I realized it doesn't matter if you don't understand every word, __4__ I was afraid to
speak in class because I thought my classmates might laugh __5__ me. I couldn't always make complete
sentences, either. Then I started to __6__ English-language TV. It helped a lot. I think that doing lots of
listening practice is one of the secrets of __7__ a good language learner. Another thing that I found very
difficult was English __8__. So I decided to take lots of grammar notes in every class.

( )1. A. lucky
( )2. A. talked
( )3. A. think
( )4. A. either
( )5. A. to
( )6. A. watched
( )7. A. making
( )8. A. grammar

B. happy
B. talk
B. believe
B. neither
B. with
B. watch
B. becoming
B. words

C. difficult
C. sing
C. forget
C. also
C. at
C. watches
C. changing
C. pronunciation

D. great
D. sang
D. understand
D. too
D. in
D. watching
D. turning
D. tests

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解方程：x²=

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旅游是人类最古老的社会性活动之一，是( )发展到一定阶段的产物。

A．社会历史

B．社会经济

C．社会文化

D．社会交往

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驰名商标的认定机关，大多数国家（包括我国）是由本国的_____来组织认定。

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叙述层面构造的类型及特征。

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