游客
题文
1.

We live on the earth. We use the sea around us. What do we take from the ocean? And what do we give to it?
We take fishes from the ocean-millions of kilograms of fish, every year, to feed millions of people.     We take minerals(矿物) from the ocean. We can get salt by evaporating(蒸发) seawater.      Many other minerals, such as gold, can be also got from the sea, but not by simple evaporation.     Seaweed(海草) becomes food of many kinds- even candy, and ice cream-as well as medicine. Believe it or not, fresh water is another gift from the sea. We can't drink ocean water.       But ocean water becomes fresh water when the salts are removed. In the future, we will find ourselves depending more and more on fresh water from the sea.
The sea gives us food, fertilizer, minerals, water and other gifts. What do we give the sea? We pollute the ocean all the time.    Throwing waste into the ocean is killing off sea life. Yet as the world population grows, we may need the sea and its gifts more than ever.
We are finally learning that if we destroy our sea, we might also destroy ourselves. Hopefully, it is not too late.
根据以上内容,从下列五个选项中选择适当的句子还原到短文中,使短文完整与正确。将其标号在答题卡上涂黑。(每小题2分,共10分)



A.Other gifts from the sea , such as seaweed, can be also got from the sea.
B.Huge as it is, the ocean can't hold all that we pour into it.
C.Along with salt, other minerals are left after evaporation.
D.We even use their bones(骨头) for fertilizer(化肥).

E. Some of its contents(所含物) may cause illness.

科目 化学   题型 选择题   难度 较难
登录免费查看答案和解析
相关试题

燃煤发电厂利用反应2SO2+2CaCO3+X=2CaSO4+2CO2
来减少SO2的排放,其中X的化学式为

A.O2 B.CO C.CO2 D.H2

将一定质量的A、B、C、D四种物质方一密闭容器中,在一定条件下反应一段时间后,测得各物质得质量如下:

物质




反应前的质量(g)
6.4
3.2
4.0
2.5
反应后的质量(g)
3.8
待测数据
7.2
2.5


下列说法中错误的是(   )
A.A和B时是反应物,D可能是催化剂
B.上表中的待测数据的数值为0.6
C.C物质中元素的种类,一定等于A、B二种物质中元素的种类之和
D.该反应一定属于化合反应

将20克甲、5克乙、8克丙三种纯净物混合,在密闭容器中加热发生化学反应,经分析可知:反应后混合物中含有5克甲、16克丙,还含有一种新物质丁。则丁物质的质量是

A.12g B.9g C.4g D.17g

将一定量的丙醇(C3H8O)和氧气置于一个封闭的容器中引燃,测得反应前后各物质的质量如下表:

物质
丙醇
氧气

二氧化碳
X
反应前质量/g
6.0
12.8
0
0
0
反应后质量/g
0
0
7.2
8.8
a


下列判断正确的是
A.表中a的值为2.8
B.X一定是该反应的催化剂
C.X可能含有氢元素
D.若起始时氧气的质量是14.4g,则无X生成

火力发电厂的燃料主要是煤,煤燃烧排放的SO2、NO2等污染物不仅污染空气,还会开成酸雨。湖南邵阳某发电厂处理NO2的反应原理为CH4+2NO2==CO2+X+2H2O,则X的化学式是()

A.C B.N2 C.CO D.O2

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号