Grandparents are respected in many human societies. But telling stories about old times and overfeeding grandchildren seem like human qualities. Are these classic grandparent behaviors really limited to humans?

Do any animals know their grandparents the way people do?

For most species on Earth, the answer is certainly " No" . " Usually, there aren't grandparents around anymore when an animal is born,"  said Mirkka Lahdenpera, a biologist at the University of Turku in Finland. " Even if an animal's life span does overlap (重叠) with its grandparents', most species spread out to avoid competing for resources, so the chance of running into a grandparent is slim." 

But there are a few clear exceptions, primarily among mammals (哺乳动物) that live in close social groups. In troops of langur monkeys in India, older females lived together with their daughters and grandchildren. The grandmother langurs defend the group's babies against attacks and even give their own grandchildren special treatment.

Many whale species, too, travel in family groups that include both grandmothers and grandchildren.

Elephant herds are also famously matriarchal. They are led by a grandmother, who can live to around 80 years old, and are generally made up of her daughters and their young. The females in a herd form close bonds and work together to raise their young.

Lahdenper found that the babies of young mothers were eight times more likely to survive if their grandmothers lived near them than if they didn't. When the young mothers were older and more experienced at raising babies, this beneficial grandmother effect disappeared even if the actual grandmothers were still around.

Indeed, most evidence for the benefits of grand parenting comes from mammals. But in 2010, researchers found that in troops of insects called gall-forming aphids, older females defend their relatives after they've stopped reproducing (繁殖).

And what about grandfathers? Studies of humans in recent decades have shown that a living grandfather can improve a person's mental health and other indicators of well-being. But there's no evidence of that in the animal kingdom. Male animals rarely socialize with their own children, let alone any grandchildren.

How do you feel when a teacher says it's time for a test? Do you get worried about it? Look at the next test skills （技巧）!

☆Go to class on time and do your homework carefully.

In this way, you will learn the lessons, such as Chinese, English, maths, and so on. You won't have so many worries.

☆Relax and go to bed on time.

After you finish your lessons in the afternoon, you need to relax in the evening and sleep well at night.

☆Get ready well.

You may take paper, a pen, pencils, an eraser, a watch, and books or a dictionary with you.

☆Read the questions carefully.

You must read the questions carefully before you answer them, or you will make mistakes.

☆Breathe （呼吸） deeply.

When you feel worried, put your pencil down on the table, close your eyes, breathe deeply and count numbers to 10. In this way, you will feel relaxed and you can do well in the test.

A Chemical reactions(化学反应)make for some great experiments.You can make use of the CO₂ (carbon dioxide) given of by a baking soda and lemon Juice reaction to blow up your balloon! 

What you'll need:

★Balloon 

★About 40 ml of water (a cup is about 250 ml so you don't need much) 

★Soft drink bottle ★Juice from a lemon 

★1 teaspoon of baking soda Instructions: 

★Before you begin, make sure that you pull the balloon long to make it as easy as possible to blow up. 

★Put the 40 ml of water into the soft drink bottle. 

★Add the baking soda and mix it with water. 

★Put the lemon juice in and quickly put the balloon over the mouth of the bottle. 

What's happening?

If all goes well, then your balloon should inflate(膨胀)! Adding the lemon juice to the baking soda creates a chemical reaction and produces CO₂. The gas rises up and escapes through the soft drink bottle. It doesn't, however, escape the balloon, pushing it outwards and blowing it up. 

After a relaxing weekend, children have to go back to school on Mondays. For parents, they should do something helpful (有帮助的) to let their children get to school on time.

Let children take a good shower. It's good for children to take a shower before they go to bed. It can not only help them sleep well but also save time next morning.

Ask children to go to bed early. School starts at 8：00 a.m. So please let your children go to bed before 9：30 p.m. Your children should (应该) sleep for about nine hours every day. This is quite important because they have to get up early next day.

Make a good breakfast for children. Breakfast can help children study better (更好的) in the day. It can help students listen to teachers carefully (细致地) and think well in class. Also, it's good for their health.

Getting to school on time is very important for your children. So please help them. If you can do the things above (以上), they will study and live happily.

A big test makes students feel fear and anxiety(焦虑的). But taking tests is something faced by all students at all levels of schools. How do you prepare for the tests as well as reducing fear? {#blank#}1{#/blank#} Maybe they will be of use to you. 

Calm down. Don't panic. {#blank#}2{#/blank#} You will be focusing on the fear, and not the coming test. Many times, fear can even prevent you doing well. If you panic, take deep breaths, and think that you can do this. 

{#blank#}3{#/blank#}People who make a detailed study plan often have an easier time of their studies. When making a study plan, calculate(计算)the amount of time you have left before the exam date. Is the exam in a month? Did the teacher spring the test on you suddenly? Is it a mid-year exam that has been waiting since the start of the year? Depending on the time, make your study plan long or short. 

Take notes and ask questions. If you come across what you can't understand, write it down. {#blank#}4{#/blank#}And don't worry—you aren't stupid if you ask questions. Questions mean that you're actively learning. Besides, a question ahead of time could mean a better grade on the exam. 

Good study skills help to achieve better results with less effort. So use the ones that work for you. 

What else can you do to prepare for a test? (请用10词左右的句子回答问题){#blank#}5{#/blank#}