Middle School Laboratory Safety Rules
Science is about discovering and exploring the natural world. Explorations can happen in the classroom, laboratory or field. As part of your science lessons, you will take part in many activities using many different materials, equipment and chemicals, which can be dangerous if not used correctly. As a result, you may be faced with biological, chemical or physical hazards.
Safety is THE MOST IMPORTANT thing. The following safety rules have been developed for the protection and safety of everyone.
★Behave yourself in a responsible way at all times. Risky behavior-such as throwing things and doing experiments without teachers' instructions is not allowed.
★Eating, drinking, chewing gum, wearing make-up, touching contact lenses (隐形眼镜) or other unsafe activities are not allowed.
★Do not enter or work in the laboratory unless an instructor is present.
★Never enter areas where chemicals are kept.
★Taking any chemicals or equipment away from the classroom or laboratory is not allowed.
The safety rules must be followed at all times. Review these rules with your teacher and parents, then sign and get the signature (签名) of a parent. The signature shows that you understand the lab can be dangerous, and that you have read the rules and agree to follow them at all times. Signatures are needed before you can go on with any lab or science classroom activity.
On September 7, 1930, Yuan Longping was born in Beijing. Fluent in English, his mother often read Friedrich Nietzsche's works to him. Influenced by his mother, Yuan Longping liked English, geography and chemistry at school. After graduating from university, he became a teacher in the countryside of Hunan in 1953.
With lots of crop failures, nationwide hunger hit China in the 1960s, making many people live a bad life. Yuan was sad and felt he must do something. Since the climate in Hunan was not friendly to growing wheat. He decided to devote himself to studying how to increase the production of rice, a basic food for over 60 percent of Chinese people. From then on, he began a lifelong connection with rice.
Yuan Longping succeeded in growing the world's first high production hybrid rice (杂交水稻) variety in 1973, which could reach a yield of over 500 kg per more than 200 kg than before. For the next four decades, he continued to work on the research of hybrid rice. In 2020, hybrid rice developed by his team achieved 1,500 kg per mu in two growing seasons, a new world record.
Nowadays, the hybrid rice is grown in almost half of China's rice fields and its production accounts for 60 percent of the total rice production in China. The hybrid rice production is 20 percent more than the common kinds , the yearly increase of which feeds up to 100 million people.
In 2019, Yuan Longping, known as the " Father of hybrid rice" , was awarded with Medal of the Republic, China's highest honor.
Yuan Longping's biggest dream in life was to develop more hybrid rice varieties, which could be grown all over the world to help solve the global food problem. So far, the hybrid varieties he developed have been grown in over 40 countries, including the USA, Brazil and India.
All the wisdom of the ages and all the stories that have delighted mankind for centuries are easily and cheaply available to all of us within the covers of books. The most unfortunate people in the world are those who have never discovered how satisfying it is to read good books.
Reading is the pleasure of the mind, which means that it is a little like a sport: your eagemess and knowledge and quickness make you a good reader. Reading is fun, not because the writer is telling you something, but because it makes your mind work. Your own imagination works along with the author's or even goes beyond his. Your experience,compared with his, brings you to the same or different conclusions, and your ideas develop as you understand his.
Every book stands by itself, like a one-family house, but books in a library are like houses in a city. Although they are separate, together they all add up to something. They are connected with each other and with other cities. Books influence each other, they link the past, the present and the future and have their own generations, like families. Wherever you start reading, you connect yourself with one of the families or ideas, and in the long run, you not only find out about the world and the people in it but also you find out about yourself. to -.
Reading can only be fun if you expect it to be. If you concentrate on books somebody tells you "you ought" to read, you probably won't have fun. But if you put down a book you don't like and try another till you find one that means something toyou, and then relax yourself with it, you will almost certainly have a good time and if you become, as a result of reading, better, wiser, kinder, or more gentle, you won't have suffered during the process.
What comes into your mind when you think of British food? Probably fish and chips or a Sunday dinner of meat and two vegetables. But is British food really so uninteresting? Even though Britain has a reputation for less-than-impressive cuisine, it is producing more top class chefs who appear frequently on our television screens and whose recipe books frequently top the best seller lists.
It' s thanks to these TV chefs rather than any advertising campaign that Britons are turning away from meat-and-two-veg and ready-made meals and becoming more adventurous in their cooking habits. It is recently reported that the number of those sticking to a traditional diet is slowly declining and around half of Britain' s consumers would like to change or improve their cooking in some way. There has been a rise in the number of students applying for food courses at UK universities and colleges. It seems that TV programmes have helped change what people think about cooking.
According to a new study from market analysts, 1 in 5 Britons say that watching cookery programmes on TV has encouraged them to try different food. Almost one third say they now use a wider variety of ingredients (配料) than they used to, and just under 1 in 4 say they now buy better quality ingredients than before. One in four adults say that TV chefs have made them much more confident about expanding their cookery knowledge and skills, and young people are also getting more interested in cooking. The UK' s obsession (痴迷) with food is reflected through television scheduling. Cookery shows and documentaries about food are broadcast more often than before. With an increasing number of male chefs on TV, it' s no longer " uncool" for boys to like cooking.
If something that you' re doing doesn' t challenge you, then it doesn' t change you. We all need some normal stress in our lives, after all. So challenge the following limits:
⒈Figure out what you' re scared of and do it continuously.
If you' re a salesman, and you' re scared of talking to people personally or over the phone now, instead of being scared and thinking you' ll fail, spend at least five minutes a day to pick up the phone and make a call. But don' t stop on the first try! Eventually, you can look at fear in the eye and say, " Go on. I' m not scared! "
⒉
Make sure this hobby is not linked to your career; you have to relax and relieve your stress while performing this. Some examples might be cooking, sewing, painting and so on. Apart from helping you challenge yourself, taking a class for your hobby may also give you extra income.
⒊Set aside at least nine minutes a day for physical exercise.
A simple 9-minute run around your neighborhood can do wonders for yourself. Exercise can not only help you maintain your regular weight, but also make you feel better about yourself.
⒋Travel and allow yourself to be interested in new people.
Don' t just limit yourself to your fellow travelers, try to connect with the service staff. You never know what kind of people they' re going to be. Get out of your house or go online to book your ticket right now.
A. Someone may hang up on you.
B. You should do it continuously.
C. You don' t need to go to the gym.
D. Running in the gym may be a better choice.
E. Start to travel now and learn to challenge yourself.
F. Take a class for a hobby you' ve been wanting to develop.
G. You can never see any improvement if you stick to your comfort zone.
As a teenager, I was pretty lazy when it came to doing things for my family. I found myself refusing to 1 out at home with even the simplest things.
Every Wednesday afternoon, for example, my mother 2 me to another town for a piano lesson. During my two-hour lesson, she' d rush to the nearby store and buy a week' s worth of 3 . Given the fact that my mom had driven me twelve miles there, twelve miles back, and 4 for my lesson, you' d think I' d be very 5 to help her bring the groceries into the house. But I wasn' t. I generally just brought in an armload and left the rest for Mom as I ran to my room and shut the door.
Don' t get me wrong. Back in my room, I felt 6 about not helping my mother more. Deep inside, I wanted to change my 7 . But I also realized that once I took on more responsibility, my parents would start 8 more from me. At age fifteen, I sensed that this one small change would mark something much bigger: my personal change from a spoiled(宠坏的) child to a more 9 young man.
I' ll never forget the Wednesday when I made a(n) 10 to try and see what would happen. Returning home from the lesson I disappeared into my room, as usual. But once inside, I felt that deep and burning 11 . Throwing my school books on the bed, I suddenly opened my door and 12 back to the garage to help my mother. How happy I felt that day! Surely, over time, I continued to help out with more housework. The more I helped out, the 13 I felt about myself. As Mom and Dad realized they could 14 on me more, our trips became far less stressful, too.
Sometimes the little things we put off doing for the longest time 15 out to be simplest things to complete. Feeling happy beats feeling guilty any day.
A MOTHER'S DAY SURPRISE
The twins were filled with excitement as they thought of the surprise they were planning for Mother's Day. How pleased and proud Mother would be when they brought her breakfast in bed. They planned to make French toast and chicken porridge. They had watched their mother in the kitchen. There was nothing to it. Jenna and Jeff knew exactly what to do.
The big day came at last. The alarm rang at 6 a. m. The pair went down the stairs quietly to the kitchen. They decided to boil the porridge first. They put some rice into a pot of water and left it to boil while they made the French toast. Jeff broke two eggs into plate and added in some milk. Jenna found the bread and put two slices into the egg mixture. Next, Jeff turned on the second stove burner to heat up the frying pan. Everything was going smoothly until Jeff started frying the bread. The pan was too hot and the bread turned black within seconds Jenna threw the burnt piece into the sink and put in the other slice of bread. This time, she turned down the fire so it cooked nicely.
Then Jeff noticed steam shooting out of the pot and the lid starting to shake. The next minute, the porridge boiled over and put out the fire. Jenna panicked. Thankfully, Jeff stayed calm and turned off the gas quickly. But the stove was a mess now. Jenna told Jeff to clean it up so they could continue to cook the rest of the porridge But Jeff's hand touched the hot burner and he gave a cry of pain Jenna made him put his hand in cold water. Then she caught the smell of burning. Oh dear! The piece of bread in the pan had turned black as well.
注意：1词数应为150左右 2. 请按如下格式在答题卡的相应位置作答。
As the twins looked around them in disappointment, their father appeared.
The twins carried the breakfast upstairs and woke their mother up.
