Everybody needs water. Everything needs water. We use water to wash the bowls(碗), clothes and ourselves. We use water to plant trees, flowers and crops(庄稼). Where does all water come from? It comes from clouds.

    Some of rain goes into the ground. Many people get it under the ground. Some rain water goes into the hills. It runs into lakes and rivers. Many people get it there.

    Personal planes which can take off noiselessly from the back garden will be possible within two years.

    Lilium Aviation is inventing an electric two-seater airplane which  takes just 20 hours to learn to fly and can travel at speeds of  250mph.More importantly, the small plane, which weighs just 25kg, can take off vertically which means it does not need to fly from an airport, but could be parked outside a house or in a garden. The company says the design will “open the door to a new class of simpler, quieter and environmentally friendly planes” and will be possible from 2018.

    “Our goal is to develop an airplane for use in everyday life,” said Daniel, CEO and one of the company's four founders. "We are going for a plane that can take off and land vertically and does not need the difficult and expensive infrastructure of an airport.

    Although helicopters offer a choice, they are very noisy and difficult to fly and require expensive licenses. They also have no backup if the rotor fails, making them costly to build and keep. While firstly limited to airfields, the Lilium airplane will eventually take off vertically from almost anywhere – even from back gardens – it needs only an open flat area of 50 ft. by 50ft (15 m x 15m).

    The plane is classed as a Light Sport Aircraft for two users, with the pilot's license requiring 20 hours' minimum training – almost like taking a driving license. It is intended for fun flying during daylight, in good weather conditions and in least crowded airspace up to 3 km altitude. The airplane would have to follow the same flight laws as helicopters.

Spider monkeys are. New World primates（灵长类）. They get their names because they have very long limbs（四肢）and tails, which make them look like spiders. They are often seen with their limbs on different branches.

Spider monkeys can be in tropical forests of Central and South America, from southern Mexico to Brazil. They are 35 to 66 centimeters long and weigh 13 to 26 pounds. They have long tails that they use to catch tree branches, kind of like a 5th hand.

Spider monkeys live in groups. One group usually has dozens of spider monkeys. They communicate with each other through screeches（尖叫声）. A night, spider monkeys break off into smaller sleeping parties of about half a dozen or fewer. Unlike many other primates, males（雄性）stay together throughout their lives with the females. They leave their first groups to find another group.

When they go out to look for food, spider monkey groups take separate actions in order to avoid competition for it. They mainly eat fruit and nuts. They also eat other things like insects, honey, leaves, spiders and bird eggs. Spider monkeys actually play an important part in the spreading of seeds throughout the South American rain forests. Enemies that they need to keep an eye out for include animals like lions and crocodiles.

Spider monkeys are dying out. Woodcutting, which leads to the loss（丧失）of their natural living places, is playing a big role in their loss. These monkeys are also hunted for food, or to sell as pets. Spider monkeys are actually one of the most popular monkey pets around because of their look and their behavior. We must do something to protect them. After all, such good and interesting monkeys should live with humans for many years to come.

The Chongyang Festival falls on the ninth day of the ninth lunar month.It is also called the Double Ninth Festival.As both the month and the day are nine，it got its name.Today ，people usually celebrate the day1 climbing mountains and enjoying chrysanthemum（菊花）， 2 the festival is also known as the Height Ascending（登高） Festival or the Chrysanthemum Festival.3 meaningful festival it is!

The festival has a history of over 2，000 4 .During the Warring States Period，there was the Chongyang Festival.But it was 5 celebrated in the imperial palace（皇宫）.From the Han Dynasty，it began to be very 6 among the common people.7 name of the Chongyang Festival first turned up in the Three Kingdoms Period.It was not set as a festival until the Tang Dynasty.Since then，all the people 8 the festival with different kinds of activities.

In the Ming and Qing Dynasties，people in the imperial palace all ate flower cakes to celebrate it.The emperors climbed mountains on that day as well.They believed 9 they could get good exercise and long life in this way.In 1989，the Chinese government set the day as the Seniors' Day.

As September has the clear sky and fresh air，it is a good time10 mountains.Also，it is good for our health.

 You are walking down the street. Suddenly it starts to rain and you don't have an umbrella. What do you do? Run or walk?

 Most people would rather run because it will get you out of the rain faster. But if you run, you also run into more raindrops. So, what should you do?

 Things are more complicated(复杂的) than you might think. Franco Bocci, a professor at the University of Brescia in Italy, found that whether you should travel slowly or quickly in the rain depends on the wind direction and your body shape, according to the BBC

 When there is no wind, and the rain lands directly on you, Bocci suggests that you should run and hide as fast as possible. But if the wind comes from behind and blows the rain onto your back, the best thing to do is to walk at the same speed as the wind. This way , both your front and back will stay mostly dry.

 This is not all. When the wind blows in from the side, you' ll have to think about one more thing— your body shape. Thinner people are hit by fewer raindrops. In this case, a fatter person had better run while a thinner person should still try to match their speed to the wind.

" In general, the best thing is to run, as fast as you can- not always, but in general ." Bocci told BBC News," If you' re really thin, it's more probable that there will be a best speed. Otherwise , it is better to run fast."

Now you know what to do next time the rain catches you in the middle of the street. But the best way to stay dry is still to carry an umbrella.

Qixi Festival, also known as Chinese Valentine's Day, {#blank#}1{#/blank#} the seventh day of the seventh lunar month. It celebrates the love story of the Cowherd and the Weaver Girl, who are only{#blank#}2{#/blank#} to meet once a year on the Magpie Bridge. On this day, {#blank#}3{#/blank#}express their love through gifts and special activities. Traditional customs {#blank#}4{#/blank#} stargazing and blessing happiness and love. Young people often celebrate by going on dates, enjoying romantic {#blank#}5{#/blank#}, and taking part in Qixi-themed events. It's a day filled with romance and hope for eternal love.