问题 选择题

下列实验原理、装置、试剂选用、结论正确的是(  )

A.用湿润的pH试纸测定稀盐酸的pH

B.用下图1构成锌-铜原电池

C.用下图2根据有关实验现象推知酸性:CH3COOH>H2CO3>C6H5OH

D.用下图3验证溴乙烷发生消去反应生成烯烃

答案

A.用湿润的pH试纸测定稀盐酸的pH,相当于盐酸稀释,测得盐酸的pH偏大,故A错误;

B.左端烧杯发生置换反应,整个装置不能形成电势差,则不能形成原电池,故B错误;

C.由醋酸和碳酸钠溶液反应生成碳酸,碳酸与苯酚钠溶液反应生成苯酚可知,酸性为CH3COOH>H2CO3>C6H5OH,故C正确;

D.乙醇易挥发,且乙醇也能被高锰酸钾氧化,则使高锰酸钾褪色的可能为乙醇,也可能为溴乙烷的消去产物(乙烯),故D错误;

故选C.

阅读理解

根据短文内容判断下列句子的正误,正确的用 "A" 表示,错误的用 "B" 表示。

    In Europe many people died during the Second World War. As a result, at the end of the war there

wcrc manv orphans(孤儿)there.A man called Hermann Gmeiner wanted to help these children. His idea

was simple. He wanted orphans to have a home, and he wanted them to have the care ancl kindness of

parents.  Gmeiner asked people to give him some money.  With this money he built the first SOS Children's Village at Imst, in Austria.  It opened in 1949. This is how the SOS Children's Village started. The

letters SOS stand for "Save Our Souls(灵魂)".This means "Please help us!".An SOS Children's Village

giVeS help to orphans.

    Hermann Gmeiner's idea for helping orphans soon spread(传播)all over the world. By 1983 there were 170 SOS Children's Villages in the world. People in many countries give money to help the villages.Today the children from the first village are grown up. Now some of them work in other SOS Children's Villages.

    In SOS Villages orphans live in family groups. There are several houses in each village. The biggest

villages have 40 0r 50 houses! Between seven and ten children live in a house.  A woman lives with each

groul, of children and looks after them.  She gives the children a lot of love and kindness. She cooks for

them and makes comfortable(舒适的),happy home for them.

    Of' course, the children don't spend all their time in the village. They go. to school, they go out with

their friends and they go into town. But the village gives them a home-sometimes for the first time in heir

lives.

( )l.  An orphan is a child who has no parents; no brother and no sister.

( )2. Gmeiner built the first SOS Children's Village with his own money,

( )3. Some of the children who are grown up work in other SOS Children's Villages.

( )4. There are about 30 houses in the biggest SOS Children's Villages.

( )5. We can conclude(推论)from the article that the money for helping the SOS Villages mainly comes from people in general.

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