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
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相关试题

下列图像与对应选项关系合理的是

A.在某温度下,向一定量接近饱和的硝酸钾溶液中,不断加入硝酸钾晶体
B.向NaOH溶液中滴加稀盐酸至过量
C.用相等质量的双氧水来制取氧气
D.电解水生成氢气和氧气

下列除杂质的方法不正确的是

选项
物质(括号内为杂质)
除杂方法
A
NaCl(Na2CO3)
加入足量稀盐酸,蒸发结晶
B
KCl(MnO2)
溶解,过滤,蒸发结晶
C
CO2(CO)
在空气中点燃
D
Cu (Fe)
加入足量的稀盐酸,过滤

下图是甲、乙、丙三种物质的溶解度曲线。下列说法错误的是

A.要配制相同质量分数的甲、丙两种物质的饱和溶液,应该将温度控制在t1
B.t2 ℃时,将30 g甲物质加入到50 g水中不断搅拌,形成的溶液的质量是80g
C.要从甲物质的饱和溶液中获得晶体甲,可采用降温结晶的方法
D.将丙物质的饱和溶液转化为不饱和溶液可以采用加水或降温的方法

下列关于化肥、农药的说法中,正确的是

A.农药有毒,应该禁止施用农药
B.磷酸铵[(NH4)3PO4]和氯化钾均属于复合肥料
C.氯化铵与熟石灰混合、研磨,能闻到刺激性的气味
D.只观察外观,不能区别硫酸钾与磷矿粉

下列物质的用途与性质的对应关系正确的是

物质
用途
性质
A氧化钙
干燥剂
能与水反应
B稀硫酸
除铁锈
不易挥发
C氩气
保护气
通电后能发出有色光
D金刚石
切割玻璃
稳定性

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