题干

下列图象关系正确的是

A                  B                 C                 D

A:表示向足量的稀CuCl2中加入少量Fe,溶液质量与时间的关系图

B:表示向一定量的稀硫酸中加入过量Ba(OH)2溶液,溶液的pH与Ba(OH)2溶液体积的关系图

C:表示一定温度下,向一定量的饱和氯化钠溶液中不断加入蔗糖晶体时,溶液中氯化钠的质量分数与蔗糖质量的关系图

D:表示CO还原氧化铜实验中,试管内固体质量与反应时间的关系图

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答案(点此获取答案解析)

A

同类题1

根据短文内容,完成下面的表格。

      In common with other countries, Britain has serious environmental problems. In 1952, more than 4,000 people died in London because of the smog. The government introduced new laws to stop smog from coal fires and factories and the situation improved a lot.

      Today, London is much cleaner but there is a new problem: smog from cars. In December 1991, there was very little wind in London and pollution increased a lot. As a result, about 160 people died from pollution in just four days.

      One of the problem is the new "out of town" shopping centres. In the past, people often walked to shops near their homes or went by bus. Now, many people drive to the new shopping centres. Because the small shops have disappeared in the downtown, more people have to travel to do their shopping.

      Critics say that Britain needs better and cheaper public transport. Transport in Britain is very expensive. An early morning train trip from Glasgow to London (about 600km) can cost about £100, for example. A short 15-minute bus trip can cost over £1.00.

      Many people are trying to reduce the use of cars in Britain. Some cities now have special bicycle paths and many people cycle to work. Some people also travel to work together in one car to reduce the pollution and the cost.

Environmental ____ in Britain

Time

causes

____

Solutions

In the ____

Smog ____ coal fires and factories

____ 4,000 people died in 1952.

New laws were ____.

Today

Smog caused by ____.

About 160 people ____ in a few days in 1991.

★Provide better and ____ public transport.

★Build special paths for bicycles.

★Travel to work ____ in one car.