问题 选择题

C、N、S都是重要的非金属元素,以下分析正确的是

A.三者对应的氧化物均为酸性氧化物

B.三者的单质直接与氧气反应都能生成两种以上氧化物

C.同温度、同浓度的Na2CO3、NaNO3、Na2SO3溶液的PH:NaNO3< Na2SO3< Na2CO3

D.CO2、NO2、SO2都能与H2O反应,其反应类型相同

答案

答案:C

题目分析:A.CO,NO是不成盐氧化物,错误。B.只有氮元素的单质直接与氧气反应都能生成两种以上氧化物,其它两种不满足,错误。C.根据盐类水解规律和水解本质,根据盐所对应酸的酸性越弱越水解做出判断,故同温度、同浓度的Na2CO3、NaNO3、Na2SO3溶液的PH:NaNO3< Na2SO3< Na2CO3,正确。D.NO2与H2O的反应是氧化还原反应,其它两个都是化合反应,错误。

阅读理解

My husband can plan wonderful surprise celebrations for me.Recently,however,I told him I didn’t want him to plan one for my upcoming birthday.

“Why?” he asked.

“I am embarrassed being the center of attention,”  I quickly explained.

Later,I began to think more deeply about this reason. Then I remembered the surprise celebration I had planned for my friend Nancy on her 60th birthday. We  were roommates on a three­week tour following the Silk Road on those famous steppes  (大草原)—and through the  mountains—of central Asia.

That  afternoon  we  had  arrived  at  our  hotel  in Samarkand,Uzbekistan. The young man at the hotel desk told me about a bakery about 10 minutes away. After giving me detailed directions,he added,“Your nose will let you know when you arrive there.”

The temperature was 40 ℃.Soon,my_olfaction proved to be an unfailing guide. Outside the bakery,a delicious smell greeted me.

There were several kinds of breads,cookies,and cakes on display. There were also beautiful iced cakes. I chose a cake topped with powdered sugar.

Later at the Karim Bek Restaurant,Nancy didn’t see the young waiter walk up the steps with the cake.When I began singing“Happy Birthday,”everyone at our table—except Nancy—joined in.

It took her a moment to realize what was happening. Then the grinning (咧嘴笑的)  guest of honor thanked me,blew out the candles on the cake,and ate three pieces of it.

Today,after reliving this experience in my mind,I told my husband to ignore my request.I now understand what a surprise party is about:It is not about having a surprise party but rather the delight in giving it. That is what brings the satisfying joy.

小题1:Why did the author go to the bakery?

A.To get some bread for her journey.

B.To experience the local taste in Samarkand.

C.To buy a birthday cake for her friend.

D.To eat some iced cakes to cool herself down.小题2:The underlined words “my olfaction” in Paragraph 7 most probably refer to________.

A.the waiter at the hotel

B.the author’s sense of smell

C.the author’s friend

D.the author’s map小题3:The party held at the Karim Bek Restaurant was________.

A.very successful

B.a little simple

C.quite boring

D.too noisy小题4:From the last paragraph we learn that now the author________.

A.becomes less interested in surprise parties

B.thinks surprise parties are embarrassing

C.enjoys giving others surprises

D.realizes the true meaning of surprise parties小题5:From the passage,we can NOT infer that________.

A.the author’s birthday is coming

B.the author’s husband loves her very much

C.the author and Nancy have been roommates for three weeks

D.the author has already spent her 60th birthday

填空题