Did you spend much time lying on the comfortable sofa at home during the summer vacation? How often did you do sports this summer? People across the world need to get moving, according to a new study by the World Health Organization (世界卫生组织).

    5% of adults do not get enough exercise, according to the study. This number hasn't changed from 2001. Because of this, about 1.4 billion people are close to deadly diseases (疾病) such as heart disease and cancer (癌症).

    People should do at least 2 and a half hours of "moderate intensity (中等强度)" exercise each week, such as dancing or swimming. They can also do 75 minutes of "vigorous intensity (高强度)" exercise, such as running or playing soccer, according to the WHO.

    As for how to exercise more, experts says that we don't have to go to the gym (健身房) every time For example, we can go up and down stairs (楼梯) a lot instead of taking the lift. If we can't go to a dancing class each week, standing on one leg for 30 seconds a day is very good too.

    The study also found that women are less active than men, 32% of women hardly ever take exercise, compared to (比较) 23% of men. Women spend more time at home taking care of children and doing housework.

    But unlike that in most other countries, men are less active than women in China, with 16.6% of men and 12% of women not getting enough exercise.

    Most cars run on gas. Gas cars work verywell. But there is a problem. Cars that run on gas make the air dirty. Thedirty air is not good for people, animals or trees. Gas cars make the air dirtyfor all living things. What can we do? We can drive electric cars!

    Electric cars do not use gas. These cars donot make the air dirty. These cars have batteries that power their motors (马达). The batteries can be charged (充电) manytimes. They can be used again and again. This makes electric cars great.

    But electric cars have problems too. Theyare slower than gas cars. They are also very quiet. This means that some peoplecan't hear them when they go by. They may not think a car is coming. So theyhave to be careful.

    People are finding ways to make electriccars better all the time. Maybe one day all cars will be electric. That wouldbe much better for the world.

In San Francisco, there is a special group of volunteers. They call themselves Friends of the Urban (城市的) Forest (FUF). These volunteers want to {#blank#}1{#/blank#}. Every year, the FUF plants nearly 1,000 trees.

The FUF welcomes new volunteers all year round and in all parts of its work. On Weekend Planting Days, FUF volunteers work with common citizens (市民) to plant trees. The planting usually runs from 9 a.m. to 1 p.m. After the work is done, everyone {#blank#}2{#/blank#} over a community lunch.

On Thursday Planting Days, the FUF plants "replacement (替换) trees". As their name suggests, these trees replace trees {#blank#}3{#/blank#}. Planting Leaders are very experienced volunteers. They are able to help other volunteers at planting events. Planting Leaders usually wear a special FUF T-shirt. Some new volunteers know little about "replacement trees". They can easily find Planting Leaders and {#blank#}4{#/blank#}.

Chinese people had hotpot as early as the Shang Dynasty. At that time, people boiled foods in bronze cauldrons(青铜鼎), which had two parts — one was the pot to cook foods in soup, {#blank#}1{#/blank#} the other part was a space inside the cauldron to hold firewood.

 People started to have lattice (分格的) hotpot {#blank#}2{#/blank#} the Han Dynasty. They divided pots into several parts to enjoy different tastes.

 Yuan Mei was a poet who was very fond of food in the Qing Dynasty. He mentioned huoguo, the Chinese name for hotpot, in {#blank#}3{#/blank#} book about all kinds of food. At that time, hotpo t was very popular. People put all kinds of meat and vegetables into the hotpot. They also used different {#blank#}4{#/blank#} to make pots such as copper(铜) and iron.

 It's said that Emperor Qianlong of the Qing Dynasty {#blank#}5{#/blank#} hotpot. He had it for almost every meal. He once held a big hotpot party and invited more than 5,000 people to enjoy 1,550 hotpots.

Do you know the lion dance? It's part of traditional Chinese culture. People often perform in the night 1 the Chinese New Year. They also perform it for other happy occasions（时刻）. The lion dance is believed to 2 good luck and success. 

There are many different stories about how the lion dance 3 . One of them is like this! Hundreds of years ago, a monster called Nian came to a village in China. The villagers were 4 . Luckily, a lion chased（追逐）Nian away. A year later, Nian came back again, 5 this time the lion couldn't help. The villagers had to 6 themselves. Their "lion" danced, jumped and chased Nian away. For this 7 , people began to perform the lion dance before the Spring Festival to chase bad luck away. 

There are two different kinds of lion dances. In the southern lion dance, the dancers try. 8 to perform like a real lion. Their "lion" may shake its body. The dance can be funny. The other kind is the 9 lion dance. It has more martial（军事的）art skills like rolling and jumping. Both the southern and northern kinds are very interesting to watch, but it takes a lot of 10 to perform well. Both kinds are considered to be traditional performing arts of China.