It's a common belief that fish can't remember anything for longer than seven seconds. It may seem sad to think that every moment in their lives would be like seeing the world for the first time. But don't be so quick to feel sorry for them. A new study has found that fish have much better memories than we used to think.
In the study, researchers from Mac Ewan University in Canada trained a kind of fish called African cichlids to go to a certain area of their tank to get food. They took the fish out and then waited for 12 days before putting them back in the tank again. They found that after such a long break the fish still went to the same place where they first got food.
In fact, scientists had been thinking for a long time that African cichlids might have a good memory. But there was no clear evidence until the latest findings.
Just as a good memory can make our lives easier, it also plays an important part when a fish is trying to survive in the wild. "If fish are able to remember that a certain area contains(容纳) safe food, they will be able to go back to that area without putting their lives in danger, "lead researcher Trevor Hamilton told Live Science.
So next time you are watching your pet fish from outside the tank, perhaps you should feel closer to them—they may remember who you are.
—Sorry, I won't be long.
Students in Kenya are returning for their third term. They begin their school year in January and it is broken up into three terms. In Kenya, in the past, students were not required to attend school and the education was not free, either.
I taught math, English and physics at Chamasiri Secondary School while I was a teacher in Kenya. This school had four classrooms ﹣one for each grade, Form 1, Form 2, Form 3 and Form 4. They are the equivalent(对等) to our 9th, 10th, 11th and 12th grades. Teachers traveled from classroom to classroom instead of the students going from room to room. The Form I class had 60 students, Form 2 had 45, Form 3 had 30, and Form 4 about 12 students. The class sizes became smaller as the grades continued on. Why did this happn? Many families were very poor and could not afford the school fees(学费).
Most countryside schools in Kenya did not have a lot of money. As a result, there were very few textbooks for the students to use. I had seven math texts for my Form 2 class and 14 for the Form I class. Anything the students needed to know was put up on the blackboard and the students copied it down into their notebooks. The notebooks became the students' textbooks.
Kenyan students study ten different subject areas. Some of the students spend over an hour running home. They do chores at home and hopefully manage to find some time to study before it gets dark. Most families do not have electricity and may not even have candies for their children to study by.
Luckily, Kenyan education has been becoming better and better in the past few years. I'm sure it will have a good future.
I while I to the music.
The president _____ all people _____ our environment.
A. urge, protect B. urged, to protect C. urges, protect D. urged, protect
Many people hurt their backs when they try to lift heavy things from the floor. It is easy to hurt your back muscle(肌肉) when you try to pick up a heavy thing. However, there is a correct way to lift things from the floor. If you pick up heavy things correctly, you probably will not hurt your back.
To lift something from the floor correctly, first bend (弯曲) your knees and lower yourself. Keep your back straight. Do not bend over, from your waist (腰) keep your back and hips (臀部) and waist in a line. If you bend over, the muscles in your lower back can became hurt very easily. If you keep your back and hips straight, the muscles are stronger, because they hold up together. The other muscles can then help the lower back muscles.
As you lower yourself, try to get as close to the thing as you can, put one knee on each side of the thing. Remember at all times to keep your back straight. Put your hand under the thing that is in front of you, between your knees.
To lift the thing, you should stand up slowly. Use your leg muscles in order to stand up. In other words, lift with your legs, not with your back.
1. Which part of your body is easier to be hurt when you lift heavy things?
A. The leg muscles. B. The back muscles C. The hips D. The knees
2. Many people hurt their backs when they lift something because _______.
A. they are not strong B. the things are very heavy
C. the way to lift the things is not correct. D. they are very heavy
3. The muscles are stronger if you _______.
A. keep your back, hips and waist in a line B. bend over from your waist
C. lower yourself D. get down on your knees
4. To lift heavy things, the most important of all is to _________.
A. stand up slowly B. keep your back straight
C. bend your knees D. put one knee on each side
We are often told_______ water in our daily life.
A. save B. saving C. to save D. saves
— Kate’s allowed to chat on WeChat with her friends at home, she?
— Yes. Her parents think she is old enough.
A. doesn’t B. isn’t C. does D. is
I ______ this magazine from the library last Friday, and have ______ it for more than a week.
A. lent ; kept B. borrowed ; borrowed C. borrowed ; kept D. kept ; borrowed
句子翻译
1. 天气越来越暖和了。
___________________________________________________________________
2. 你需要每天都洗衣服吗?
___________________________________________________________________
3.为了上学不迟到，他买了一个闹钟。
___________________________________________________________________
4. 这个机器人中了病毒，结果，主人的房间一团糟。
___________________________________________________________________
5. 你认为是什么让他如此成功?
___________________________________________________________________
Sam thinks history is an ________ subject．He is ________ in it．
A．interesting；interesting B．interested；interesting
C．interesting；interested D．interested；interested
单项选择题
--- _________is your pen pal from?
--- He’s from Australia.
A. Where B. What C. How D. Why
--The blue pen is mine. ______ this dictionary?
--It’s hers.
A. What color is B. What’s C. Who is D. What about
It’s quite clever you out the problem.
A. for; working B. for; to work C. of; working D. of; to work
It's September 1 today. A new school year began. Lei Hao got up early. He wears the nicest clothes. After a quick breakfast, he said goodbye to his parents and left with his new schoolbag. His mother wanted to take him to his school, but he didn't let her do so.
“The school is less than a hundred meters from here. I can walk there in two minutes.”
There're a lot of people in the school this morning. Lei Hao found Miss Huang in the teachers' office. She brought out a book and asked,“What's your name?”
“Lei Hao,madam,” answered the boy.
“When were you born?”
“In 1990.”
“Where's your native place（籍贯）?”
“What does‘native place’mean, please?”
“It means the place where you were born.”
“Oh,I see. It’s Xinle No. One Maternity Hospital（新乐第一妇产医院）.”
1.Where's Lei Hao from?
2.How old is Lei Hao?
3.Why did Lei Hao go to school by himself（独自）?
4.What's Miss Huang?
5.Did Lei Hao understand Miss Huang?
