问题 选择题

下列说法不正确的是(  )

A.用点燃的方法除去CO2中的CO

B.用MnO2区分水和过氧化氢

C.用紫色石蕊试液区分CO2和02

D.用检验燃烧产物的办法来区别CO和CH4

答案

A、混在二氧化碳中的一氧化碳气体因不能与氧气接触,因此使用点燃的方法并不能把一氧化碳气体燃烧并除掉;故错误;

B、二氧化锰加入过氧化氢中可加快过氧化氢的分解速率生成较多的氧气,加入水中无现象,现象不同,故可通过是否生成气体区分两种物质,操作正确;

C、二氧化碳可与水反应生成碳酸使石蕊变红,故能使石蕊变红的是二氧化碳,不能使石蕊变色的是氧气,现象不同,可以鉴别,操作正确;

D、一氧化碳燃烧生成二氧化碳,甲烷燃烧生成二氧化碳和水,故可通过检验其燃烧产物是否生成水来区分两种气体,操作正确;

故选A.

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完形填空

阅读下面短文,并按照题目要求用英语回答问题(请注意问题后的词数要求)o

My grandma whom we all called Nanny was a solid, first-generation, Italian immigrant. She came to this country with her family on a tiny ship during World War I when she was only 8 years old. During the trip she survived stormy seas,little food, and an attack by a German U-boat. After getting here, her large family worked hard to build a new life in America. They neverhad much money but were rich in love.

One day, when I was about 5 or 6 years old, my parents and brothers went on a trip. It was just me and Nanny in the house for the weekend. Nanny seemed so happy to be taking care of me all by herself. She made me a special breakfast that first morning. However, all I could do was to complain about how the food was not how Mom always made it. Nanny quietly put down the plate and went into the living room. I followed a minute later and saw that she had tears in her eyes. It was the first time I had ever seen my strong and proud grandmother cry and I was the one who had caused it

I walked over to Nanny, climbed on her lap, and for the first time in my short life I did something else too. I apologized without being told to and asked Nanny to forgive me. She smiled, rubbed my head, and told me I was a good boy even though I didn't feel like one then. That memory just like my Nanny's love will stay in my heart forever. It is a sign of both strength and wisdom. Asking for forgiveness helps us to learn, to grow, and to love.

小题1:When did Nanny come to this country?(within 4 words)

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小题2:What did Nanny survived during the trip?(within 7 words)

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小题3:What kind of person is Nanny?(within 5 words)

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小题4:Why did my grandma cry one day?(within 12 words)

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小题5:What did I learn from the experience?(within 12 words)

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