A tornado (龙卷风) is a kind of strong storm with air which moves in a circle quickly. They can move over 200 miles per hour and cause a lot of damage (损坏). As they move across the land, they can easily pick up cars, trucks, and even houses, and then throw them very far. It is important to find a safe place if a tornado gets close.

A safe place could be a basement ( 地下室) or the lowest floor. If you are in a home without a basement, try to find a first-floor bathroom or a small room without windows in the middle of your house. You should curl up (蜷缩) into a ball and cover your head and neck with your hands.

But there are some people who actually want to get close to tornadoes. They are scientists who want to learn more about tornadoes. One of the best ways to do this is to get as close as possible to the tornado. They use special tools to measure (测量) what is happening in and around a tornado.

One special tool is called a tornado probe ( 探测仪). Inside the tornado probe, there are sensors (传感器) to measure wind speed, temperature, pressure, and direction.

Some probes even have cameras, so the scientists can see and understand what it's like to be in a tornado.

To be able to get these measurements, the scientists have to get a tornado probe near or into a tornado. Scientists will try to guess where a tornado will go next. Then they drive to that location and put down the probe. If they do not guess correctly, they pick up their probe and try another place. If they are right, the tornado will go near or even right over the probe. Then they take all of the measurements

from the probe and use them to predict where future tornadoes may form (形成) and travel. And they can give people some warning to keep away from a dangerous tornado.

There is an English saying:" Laughter is the best medicine." Until {#blank#}1{#/blank#}, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the human body. They find that it {#blank#}2{#/blank#} people's blood pressure, the heart beating and breathing. It {#blank#}3{#/blank#} works the stomach and even the feet. So laughter exercises the body and improves people's health.

As a result of these discoveries, some doctors in the United States now hold laughter clinics; in which they help to improve their patients' condition {#blank#}4{#/blank#} encouraging them to laugh. They have found that even if their patients do not really feel like {#blank#}5{#/blank#}, making them smile is enough to produce beneficial effects similar to those caused by laughter.

Nowadays more and more people prefer to go fishing or hiking in the woods. Experiencing nature is {#blank#}1{#/blank#}, but when you're doing this, always keep yourself safe. It's important to remember several basic rules if you don't want to turn a pleasant outing into a {#blank#}2{#/blank#}.

First, be fully prepared for different weather. Before you set out, always get warm clothes and raincoats ready, just in case! This is especially true in the {#blank#}3{#/blank#} of travelling in the mountain areas. The weather is really {#blank#}4{#/blank#} in high mountains. Sometimes you can experience two or three seasons in one day.

Second, {#blank#}5{#/blank#} a map, a compass, and a flashlight in your bag. Even experienced travelers get lost. Before you start your trip, study the map to get familiar with the area you are going to. The flashlight is important if you do get lost. Many trips that start out in daylight will {#blank#}6{#/blank#} become nighttime adventures when people can't find their way.

Third, bring a first-aid kit and know how to use it. Small cuts can be more serious when there is no doctor {#blank#}7{#/blank#}.

Finally, tell people where you are going and when you plan to come back. That way, someone will go search for you if troubles {#blank#}8{#/blank#}. This will increase your chance of being found quickly.

School education is very important and useful. Yet no one can learn everything at school, {#blank#}1{#/blank#} teacher can't teach his students everything they want to know. His work is{#blank#}2{#/blank#} (show) his students how to learn. He teaches them {#blank#}3{#/blank#} to read and think. So much more is to be learned outside school by the students.

It is always much {#blank#}4{#/blank#} (important) to know how to study by oneself. It is quite{#blank#}5{#/blank#} (easily) to learn something, but it is difficult to use it to solve problems. Great {#blank#}6{#/blank#} (invent) do not get everything from school, {#blank#}7{#/blank#}  they still invent many things and change the world a lot.

How can the inventors do all of this? One of the answers is that they know how to study. {#blank#}8{#/blank#}  fact, a lot of things are not learnt in the classroom. They get a lot of knowledge by {#blank#}9{#/blank#} (read) outside school. They work hard and never give up all {#blank#}10{#/blank#} (they)lives.

Have you seen any scarecrows (稻草人)? In the countryside of our country, some villagers like to set up some scarecrows in the fields in order to prevent birds from harming their crops. They think that this can play a role in driving away birds. In fact, not only farmers love to use scarecrows, but also some airports have installed scarecrows in such a developed technology today, which plays a very good role in driving away birds. Some people will say that birds are not fools, and they will come back to eat after a long time. So do the birds really feel scared? Can scarecrows really play a role in driving away birds? Not very — unless you're willing to put some extra(额外)effort into them.

While traditional scarecrows who couldn't move do work against "pest birds" (eg. crows and blackbirds), the effect is almost always temporary (暂时的). Over time, the birds get used to scarecrows who couldn't move and reuse their destructive (破坏性的)habits.

However, a few tricks can up your scarecrow's game. Researchers have learned that those with realistic facial features(特征)and brightly colored clothes are better at driving away birds. Also, moving a scarecrow around every few days often helps. According to several studies, flailing(大幅波动) scarecrows get the very best results.

It is said that Chinese people have"one thousand"ways to cook vegetables.In fact，Chinese people don't just love cooking delicious vegetable dishes.{#blank#}1{#/blank#} Chinese people have grown vegetables in their backyards for centuries.Now，they have also grown them in the Antarctic，and even in space!Why do they have deep love of vegetables？Here are some reasons.

●Suitable natural conditions are necessary.

China has so much land，about 9.6 million square kilometers.{#blank#}2{#/blank#} Many places have the light，soil and water that vegetables need.

●Eating and planting vegetables has a long history.

Most of today's vegetables were once wild plants.Chinese people started to eat and plant them quite early.The Book of Songs 《诗经》，written about 2，500 years ago{#blank#}3{#/blank#} Potatoes，peppers and tomatoes were all from other places，but Chinese people planted them

●{#blank#}4{#/blank#}

In ancient times，Tao Yuanming，a Chinese poet（朝堂）.{#blank#}5{#/blank#} Planting vegetables is a good way to get away from the hustle and bustle（拥挤喧嚣） of city life.