试题与答案

对某酸性溶液(可能含有Br-,SO42-,H2SO3,NH4+)分别进行如下实验

题型:不定项选择题

题目:

对某酸性溶液(可能含有Br-,SO42-,H2SO3,NH4+)分别进行如下实验:

①加热时放出的气体可以使品红溶液褪色;

②加碱调至碱性后,加热时放出的气体可以使润湿的红色石蕊试纸变蓝;

③加入氯水时,溶液略显黄色,再加入BaCl2溶液时,产生的白色沉淀不溶于稀硝酸。

对于下列物质不能确认其在溶液中是否存在的是[ ]

A.Br-

B.SO42-

C.H2SO3

D.NH4+

答案:

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阅读下面短文,根据以下提示:1)汉语提示,2)首字母提示,3)语境提示,在每个空格内填入一个适当的英语单词,并将该词完整地写在答题卷相对应的横线上。所填单词要求意义准确,拼写正确。

For 25 years Terry Cemm was a policeman, but for the last 17 years he has been   小题1: (行走)up and down five miles of beach every day, looking for things that might be 小题2:  to someone. Terry’s a beachcomber(海滩拾荒者).

Nearly everything in his cottage has come   小题3: the sea – chairs, tables, even tins of food. “I even found a box of beer just before Christmas. That was nice,” he remembers. He finds lots of bottles with messages in them,   小题4: (主要地)from children. They all get a r 小题5:  if there’s an address in the bottle. Shoes? “If you find one, you’ll find the  小题6: the next week,” he says.

But does he really 小题7:  a living? “Half a living,” he smiles. “Anyway I have my police pension. But I don’t actually need money. My life is rich in   小题8: (多样性).” Terry is happy. “You have to find a way to live a simple life.”

“Some people say I’m mad,” says Terry. “ 小题9: there are much more who’d like to do  小题10: I do. Look at me. I’ve got everything I could possibly want.”

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