问题 选择题

下列不属于水的净化措施的是(  )

A.过滤

B.吸附

C.电解

D.杀菌

答案

答案:C

题目分析:A、过滤,可以除去水中不溶性固体杂质,是净化水的方法之一;

B、吸附,利用活性炭的吸附性,可除有色、有异味等杂质,是净化水的方法之一;

C、电解,在通电条件下把水分解的方法,不是净化水的方法;

D、杀菌,通过氯气可以将水中的细菌杀死消毒,是净化水的方法;

故选C。

点评:水的净化过程包括沉淀、过滤、吸附、杀菌等过程。

阅读理解

阅读理解。

     You are standing in the kitchen and a voice says, "Add a little more salt to that soup." Yes, it's always

nice to have someone help you when you're cooking. But this voice is not from a man. You are alone!

Then where does it come from? Is it from a ghost? No, this isn't a ghost kitchen-it's the kitchen of the

future.

     Scientists are working to improve everything in the kitchen, from fridges to tables, and even the ways

we cook. They are making a system. It will help a person cook a meal. You don't need cookbooks. You

can hear how to cook food.

     The fridge of the smart kitchen has a scanner. It looks at the foods in the fridge. It will order more milk

from the store when your milk has gone bad or there is no more in the fridge. The gloves will test the

temperature of everything they touch and say, "Need to cook longer" or "Hot and ready to eat". If you

leave them on the stove by mistake, they'll say, "Fire!" Even the knives and spoons will speak. For

example, if your food is bad, the knives and spoons will tell you not to eat it.

     The future kitchen may look wonderful, but it's not cheap. The multimedia fridge costs about 8,000

dollars. So even though high-tech kitchens are no longer a dream, not everyone can afford one.

1. In the kitchen of the future, there is a ______ helping you.

A. system        

B. man        

C. ghost        

D. servant

2. In the future, you can cook by ______. 

A. reading        

B. hearing    

C. learning      

D. looking

3. The fridge of the smart kitchen has a scanner and it can ______. 

A. help you do everything          

B. clean the fridge when it's dirty

C. give you a warning when there's something wrong    

D. talk with you

4. From the passage we know that ______.

A. everybody can buy such a fridge    

B.not everybody can buy such a fridge        

C. nobody can buy such a fridge      

D. most people can buy such a fridge

判断题