These are instructions for making invisible ink using baking soda.
Difficulty: | Easy |
Time required | A few minutes |
What you need | Baking soda Paper Water Light bulb Paintbrush Measuring cup Purple grape juice |
Here’s how: | There are at least two methods of using baking soda as invisible ink. Mix equal amounts of water and baking soda. Use a paintbrush to write a message onto white paper, using the baking soda solution (溶液) as “ink”. Allow the ink to dry. One way to read the message is to hold the paper up to a heat source, such as a light bulb. The baking soda will cause the writing in the paper to turn brown. The second way to read the message is to paint over the paper with purple grape juice. The message will appear in a different color. |
Tips: | If you are using the heating method, avoid igniting (点燃) the paper. Baking soda and grape juice react with each other in an acid-base (酸碱) reaction, producing a color change in the paper. Grape juice concentrate (浓缩物) results in a more visible color change than regular grape juice. |
1.______ is not needed for making invisible ink.
A. Baking soda B. Paper
C. Water D. Ink
2.What’s the function of the paintbrush?
A. To draw a picture. B. To write a message onto the white paper.
C. To allow the “ink” to appear. D. To help the“ink” dry.
3.Why will the message appear in a different color in the second way to read the message?
A. Because there is enough grape juice.
B. Because baking soda reacts with grape juice.
C. Because of the use of water.
D. Because of the special paper.
4.From the process, we can know that making invisible ink is ______.
A. very hard B. not difficult
C. a little difficult D. not easy
高二英语阅读理解简单题
These are instructions for making invisible ink using baking soda.
Difficulty: | Easy |
Time required | A few minutes |
What you need | Baking soda Paper Water Light bulb Paintbrush Measuring cup Purple grape juice |
Here’s how: | There are at least two methods of using baking soda as invisible ink. Mix equal amounts of water and baking soda. Use a paintbrush to write a message onto white paper, using the baking soda solution (溶液) as “ink”. Allow the ink to dry. One way to read the message is to hold the paper up to a heat source, such as a light bulb. The baking soda will cause the writing in the paper to turn brown. The second way to read the message is to paint over the paper with purple grape juice. The message will appear in a different color. |
Tips: | If you are using the heating method, avoid igniting (点燃) the paper. Baking soda and grape juice react with each other in an acid-base (酸碱) reaction, producing a color change in the paper. Grape juice concentrate (浓缩物) results in a more visible color change than regular grape juice. |
1.______ is not needed for making invisible ink.
A. Baking soda B. Paper
C. Water D. Ink
2.What’s the function of the paintbrush?
A. To draw a picture. B. To write a message onto the white paper.
C. To allow the “ink” to appear. D. To help the“ink” dry.
3.Why will the message appear in a different color in the second way to read the message?
A. Because there is enough grape juice.
B. Because baking soda reacts with grape juice.
C. Because of the use of water.
D. Because of the special paper.
4.From the process, we can know that making invisible ink is ______.
A. very hard B. not difficult
C. a little difficult D. not easy
高二英语阅读理解简单题查看答案及解析
Before using the machine, you must ____ carefully to these instructions.
A join B join in C take part in D attend
高二英语单项填空简单题查看答案及解析
“It hurts me more than you” and “This is for your own good” — these are the statements my mother used to make years ago when I had to learn Latin, clean my room, stay home and do homework.
That was before we entered the permissive period in education in which we decided it was all right not to push our children to achieve their best in school. The schools and the educators made it easy for us. They taught that it as all right to be parents who take a let-alone policy. We stopped making our children do homework. We gave them calculators, turned on the television, left the teaching to the teachers and went on vacation.
Now teachers, faced with children who have been developing at their own pace for the past 15 years, are realizing we’ve made a terrible mistake. One such teacher is Sharon Klompus who speaks of her students “so passive” and wonders what has happened. Nothing is demanded of them, she believes. Television, says Klompus, contributes to children’s passivity. “We’re talking about a generation of kids who've never been hurt or hungry. They have learned somebody will always do it for them, instead of saying 'go and look it up’, you tell them the answer. It takes greater energy to say no to a kid.”
Yes, it does. It takes energy and it takes work. It’s time for parents to end their vacation and come back to work. It's time to take the car away, to turn the TV off, to tell them it hurts you more than them but it's for their own good. It's time to start telling them no again.
1.Children are becoming more inactive in study because _______.
A.they watch TV too often | B.they have done too much homework |
C.they have to fulfill too many duties | D.teachers are too strict with them |
2.By “permissive period in education” (L.1, Para. 2) the author means a time _______.
A.when everything can be taught at school |
B.when every child can be educated |
C.when children are permitted to receive education |
D.when children are allowed to do what they wish to |
3.The main idea of the passage is that _______.
A.parents should leave their children alone |
B.kids should have more activities at school |
C.it's time to be more strict with our kids |
D.parents should always set a good example to their kids |
高二英语阅读理解中等难度题查看答案及解析
“It hurts me more than you”, and “This is for your own good”—these are the statements my mother used to make years ago when I had to learn Latin, clean my room, stay home and do homework.
That was before we entered the permissive period in education in which we decided it was all right not to push our children to achieve their best in school. The schools and the educators made it easy for us. They taught that it was all right to be parents who take a let-alone policy. We stopped making our children do homework. We gave them calculators, turned on the television, left the teaching to the teachers and went on vacation.
Now teachers, faced with children who have been developing at their own pace for the past 15 years, are realizing we’ve made a terrible mistake. One such teacher is Sharon Klompus who says of her students “so passive” and wonders what has happened. Nothing is demanded of them, she believes. Television, says Klompus, contributes to children’s passivity. “We’re talking about a generation of kids who’ve never been hurt or hungry. They have learned somebody will always do it for them, instead of saying ‘go and look it up’, you tell them the answer. It takes greater energy to say no to a kid.”
Yes, it does. It takes energy and it takes work. It’s time for parents to end their vacation and come back to work. It’s time to take the car away, to turn the TV off, to tell them it hurts you more than them but it’s for their own good. It’s time to start telling them no again.
1.We learn from the passage that the author’s mother used to lay emphasis on(强调)________.
A.his learning a foreign language
B.his ability to control behavior
C.his natural development
D.his school education
2.According to the author, “the permissive period” in Paragraph 2 means a time________.
A.when children are allowed to do what they wish to
B.when everything can be taught at school
C.when every child can be educated
D.when children are permitted to receive education
3.What is the main idea of the passage?
A.Parents should leave their kids alone
B.Kids should have more activities at school.
C.It’s time to be stricter with our kids.
D.Parents should set a good example to their kids.
高二英语阅读理解中等难度题查看答案及解析
Pressure too much?
In our daily life we are used to hearing these words, “I can't wait for my holiday,” “I wish I could stay home today” And “I'm very tired.” These words come from pressure at work. Now the “iron rice bowl”(铁饭碗) is being broken into pieces. Workers may be fired if they don’t perform their duties well. They have to do their jobs better.
People feel pressure not only because they might find themselves out of work but also because they get no real pleasure from their work. For most of the workers, work is just a way of earning money. It appears to be meaningless and worthless.
But pressure is a natural part of work. There is no way to keep away from it. We should face up to it.
Work should be a cause of happiness and pride rather than a punishment or a burden .In fact, a certain amount of pressure can provide challenge and chance for learning. To a modern man who is worried and low in spirit, developing a hobby and finding a new interest is of first importance. I like listening to pop music, which makes me calm and gives me pleasure.
If pressure becomes difficult to deal with, we should turn to our friends or families. We can have a drink with our friends and talk about the problem. We should always discuss our problems with our families. Good advice, warmth and happiness that families bring to us can reduce our pressure and encourage us to smooth away all difficulties.
1.Peopel feel pressure at work mainly because ______.
A. they will lose their jobs
B. most of them find less interest in their work
C. they can make more money after work.
D. they want to stay at home.
2.Which of the following is WRONG in the writer’s opinion?
A. Where there is work there is pressure.
B. Work shouldn’t be regarded as punishment or burden.
C. All modern men are worried and low in spirit.
D. A certain amount of pressure is necessary.
3.From the text we can know that when pressure is too big, ________.
A. we should drink coffee with our friends
B. we can get help and comfort from our friends or families.
C. we can go home because it is warm
D. to talk out the problem to our friends and families is the best way.
高二英语阅读理解简单题查看答案及解析
What is the woman doing now?
A. Baking cookies.
B. Making a list.
C. Shopping for groceries.
高二英语短对话简单题查看答案及解析
--These books are both interesting and instructive.
--No wonder they __________ the youth.
A. apply to B. approve of
C. appeal to D. attend to
高二英语单项填空简单题查看答案及解析
Holidaymakers who are bored with baking beaches and overheated hotel rooms head for a big igloo. Swedish businessman Nile Bergqvist is delighted with his new hotel, the world’s first igloo hotel. Built in a small town in Lapland, it has been attracting lots of visitors, but soon the fun will be over.
In two weeks’ time Bergqvist’s ice creation(作品) will be nothing more than a pool of water. “We don’t see it as a big problem,” he says. “We just look forward to replacing it.”
Bergqvist built his first igloo in 1991 for an art exhibition. It was so successful that he designed the present one, which measures roughly 200 square meters. Six workmen spent more than eight weeks piling 1,000 tons of snow onto a wooden base; when the snow froze, the base was removed. “The only wooden thing we have left in the igloo is the front door,” he says.
After their stay, all visitors receive a survival certificate recording their success. With no windows, nowhere to hang clothes and temperatures below 0℃, it may seem more like a survival test than a relaxing(轻松的) hotel break. “It’s great fun,” Bergqvist explains, “As well as a good start in survival training.”
The popularity of the igloo is beyond doubt: it is now attracting tourists from all over the world. At least 800 people have stayed at the igloo this season even though there are only 10 rooms. “You can get a lot of people in,” explains Bergqvist. “The beds are three meters wide by two meters long, and can fit at least four at one time.”
1. Bergqvist designed and built the world’s first igloo hotel because ________.
A.an art exhibition was about to open
B.he wanted to make a name for the small town
C.he believed people would enjoy trying something new
D.more hotel rooms were needed
2. When the writer says “the fun will be over,” he refers to the fact that ________.
A.hotel guests will be frightened at the thought of the hard test
B.a bigger igloo will replace the present one
C.holidaymakers will soon get tired of the big igloo
D.Bergqvist’s hotel will soon become a pool of water
3.According to the text, the first thing to do in building an igloo is ________.
A.to gather a pool of water
B.to prepare a wooden base
C.to cover the ground with ice
D.to pile a large amount of snow
4. When guests leave the igloo hotel they will receive a paper stating that ________.
A.they have had a taste of adventure
B.they have had an ice-snow holiday
C.they have had great fun sleeping on ice
D.they have visited Lapland
5.Which of the following pictures below is closest to the igloo hotel as described in the text?
高二英语阅读理解中等难度题查看答案及解析
Stop Complaining
We are instructed not to use any dirty words or polluting language. 1.But I have learned that complaining pollute our lives at one time.
2.How quick are we to become impatient and begin to complain when stuck in traffic or while waiting in checkout narrow roads in grocery stores or department stores? How quick are we to spot and point out all the faults of our friends or family members?
The influence of excessive(过度的)complaining. Complaining can make you feel pretty down, for example. There is just so much that's wrong, everywhere, and no matter how much you complain, it just isn't possible to get it all put right. Plain and simple complaining is a behaviour that people disapprove of or consider morally wrong! 3.
Complaining can become a habit. When you made your first complaints, you carefully chose what to protest about, and to whom, and how, in order to get very specific results. 4. You have an “auto-complainer” that comes out with your criticisms to whoever is listening.
The best antidote(矫正方法) for complaining is thanksgiving.5. They are too busy being grateful for all the good things they have that they have no time to notice the things they could complain about. And also remember that it is no use complaining without taking any actions.
A. But you probably no longer do that.
B. Don’t get discouraged when you fail.
C. Truly thankful people do not complain.
D. I didn’t realize that this included complaining.
E. We need to ask ourselves something like these.
F. When you really want to stop complaining all the time.
G. It causes many people a great deal of problems in their lives and destroys the joy of anyone listening.
高二英语七选五中等难度题查看答案及解析
These companies succeeded because they were the first companies to make use of the ____________ of the internet and was thought highly of by some experts.
A.potential B.possibility C.prejudice D.precious
高二英语单项填空简单题查看答案及解析