问题 选择题

下列排序不正确的是 (    )

A.原子半径:C<Be<Mg<Na

B.稳定性:HI>HBr>HCl>HF

C.酸性:H4SiO4<H3PO4<H2SO4<HClO4

D.碱性:KOH>Ca(OH)2>Mg(OH)2>Al(OH)3

答案

答案:B

题目分析:同周期自左向右,原子半径逐渐减小,金属性逐渐减弱,非金属性逐渐增强,最高价氧化物的水化物的碱性逐渐减弱,酸性逐渐增强,氢化物的稳定性逐渐增强;同主族自上而下,原子半径逐渐增大,金属性逐渐增强,非金属性逐渐减弱,最高价氧化物的水化物的碱性逐渐增强,酸性逐渐减弱,氢化物的稳定性逐渐减弱,据此可知选项B不正确,稳定性应该是HI<HBr<HCl<HF,其余选项都是正确的,答案选B。

点评:该题是高考中的常见题型和重要的考点,属于中等难度的试题。试题综合性强,侧重对学生基础知识的巩固与训练。有利于培养学生灵活运用基础知识解决实际问题的能力,难度不大,学生不难得分。

填空题
阅读理解

Are you a big fan of pirate(海盗) stories? Do you know how to talk like a pirate? You can have fun on September 19th. This special holiday is called International Talk Like A Pirate Day. It was invented in 1995 by two young Americans, John Baur and Mark Summers.

These two good friends came up with this idea when they were playing racquetball, and began to talk like pirates. At that moment, they thought, “Young people are interested in pirate. But there is no such a chance for people to get together to share it. Why not have a day when everybody talks like a pirate?” They decided to make September 19th the date. Since then, Baur and Summers have tried hard to promote Talk Like A Pirate Day. As Baur said, “We've talked like pirates, and encouraged several of our friends to do so every September 19th.”

At first, this day was only known by a few people. In 2002, Baur and Summers sent a letter about their invented holiday to Dave Barry. This columnist(专栏作家)really liked their idea. He promoted the holiday and made it known to more and more people. Now, it has really become an international holiday. On Talk Like A Pirate Day, you need to dress like a pirate. You should wear a big hat or maybe cover one of your eyes. You can pretend to be any kind of pirate that you can find in any story or movie.

Having fun and being relaxed are not the only best things about the holiday. Young people share the same interest and childhood dreams that day. That's why it is welcomed by so many people, especially young people.

Unlike traditional holidays, International Talk Like A Pirate Day is a brand new holiday which is invented by the youth themselves and celebrated by themselves too. Because of Baur and Summers' imagination and creativity, thousands of young people's pirate dream come true. Next time, when you have a good idea, why not share it with your fiends and insist on your belief? Maybe you can create another wonderful holiday for the youth in the future.

小题1:How did John Baur and Mark Summers invent the special holiday?

A.Many young people asked them to do it

B.They did it just for pleasure

C.They thought out the idea by chance and imagination

D.They did it in order to honor pirates小题2:Why are the holiday become more and more popular?.

A.You can have fun and relax yourself freely.

B.young people can exchange ideas and dreams on the day

C.young people can have fun and be relaxed.

D.you can play the role of the pirate in the movie on the day小题3:Which of the following statements is NOT true according to the passage?

A.It was Dave Barry who made more people know the holiday.

B.Talk Like A Pirate Day is a young, active and lively holiday

C.Thanks to John Baur and Mark Summers’ imagination and creativity, a lot of people realize their pirate dream.

D.The holiday has been popular since the birth of it.小题4:According to the passage, which of the following can show that the holiday is special?

A.It has a long history.

B.It is a wonderful and instructive holiday.

C.It is a brand new holiday invented and celebrated by the youth themselves.

D.People can make their dream come true on this day.小题5:Which of the following can serve as the best title of the passage?

A.Can you talk like a pirate?

B.Young people’s pirate dream

C.John Baur and Mark Summers

D.September 19th ,—a day in honor of pirates