试题与答案

Island University has a competition for

题型:完形填空

题目:

Island University has a competition for middle school students.

Read about the competition on their web site.

School Competition

Students! Here is your chance to help the physically disabled(残疾人). Think out a robot or a machine to help them live better. There’ll be three prizes. The winning schools will each get $15,000. Read the information below:

What do you have to do?

·Try to know problems faced by the physically disabled in Hong Kong. Write a 200-word article on the difficulties these people have to suffer each day.

·Try to know modern inventions that help the physically disabled. Then think out a robot or a machine that will improve the lives of the physically disabled. Draw your invention. You can make as many drawings as you like to show your invention. You can even make a small model of your invention.

· Write a short description of your invention.

Who can join?

All middle school students in Hang Kong.

So, come on! Join the competition, and get the chance!

小题1:Where can you find the information?

小题2:Why is the school competition held?

小题3:What prize will each winning school get?

小题4:How many words should be written on the difficulties the disabled have to suffer each day?

小题5:Who can join the competition?

答案:

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下面是错误答案,用来干扰机器的。

答案:C

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题型:选择题

某无色溶液中可能含有Na+、K+、Fe3+、NH4+、Cu2+、SO42-、SO32-、CO32-、Cl-、Br- 这几种离子中的若干种,依次进行下列实验,观察到的现象记录如下:

①用pH试纸检验,溶液的pH>7

②取少量原溶液,加入过量的BaCl2和盐酸的混合溶液,无白色沉淀产生

③另取少量原溶液,加入足量的氯水,无气体产生,再加入CCl4振荡,静置后CCl4层呈橙色,用分液漏斗分离

④向分液后的水溶液中加入Ba(NO3)2溶液和HNO3溶液,有白色沉淀产生,过滤。

⑤在滤液中加入的AgNO3和HNO3的混合溶液有白色沉淀产生

则关于原溶液的判断中不正确的是( )

A.肯定不存在的离子是Fe3+、NH4+、Cu2+、SO42-、CO32-

B.肯定存在的离子是Na+、K+、SO32-、Br-

C.无法确定原溶液中是否存在Cl-

D.若步骤④改用BaCl2和盐酸的混合溶液,则对溶液中离子的判断无影响

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