In China, safety education is becoming more and more important now. The last Monday in March is for students to learn it at school. It helps students learn more about how to keep themselves safe. What are the accidents at school? Let’s take a look.

Stampedes (踩踏), earthquakes and fires are the main accidents at school.

A stampede always happens in crowded places. When students around you begin to push, just stand there and try to hold onto something. If you fall down in the crowd, move to one side and protect your head with your hands around.

When earthquakes happen, you can get under a desk quickly and hold on. It will protect you from falling things. If you are outside, find a place away from buildings, trees, and power lines.

When there’s a fire, leave the classroom quickly. It’s better to put something wet over your mouth and nose. In this way, you won’t breathe (呼吸) in smoke. Many people die in a fire, not because of the fire but smoke. It makes them cough and they can’t breathe. That’s very dangerous! So when you want to get out, you should make yourself close to the floor. Then you can breathe some fresh air.

Here are two articles from an encyclopaedia.

Da Vinci, Leonardo

Leonardo da Vinci (1452~1519) was (A) ________ Italian painter, inventor, musician, engineer and scientist.

Da Vinci was born in the countryside. When he was very young, he showed great intelligence and artistic ability. As he grew older, he learn to do many different things. His paintings are very (B) well-known, and one, the Mona Lisa, is perhaps the most famous painting in the world. He also had many inventions. For example, his notebooks include some interesting drawings of flying machines.

Dinosaurs

Dinosaurs lived on Earth (C) more than 60 million years before human beings. They lived everywhere on Earth. (D) Some dinosaurs were as small as chickens. Others were as big as ten elephants. Some could even fly.

Many dinosaurs ate plants. However, some dinosaurs liked to eat meat. Dinosaurs lived on Earth (E) ________ more than 150 million years. Then, suddenly, they all died out. (F) 没人知道为什么。However, we can learn about them from their fossils.

When Nejat began developing robots in 2005, she spent much of her time knocking on doors to let people know how her robots worked but few showed interest. “But now, it’s different” says Nejat, “people calling from around the world ask when my robots are going to be ready.”

Nejat’s robots are designed to fill an increasing need: care-giving for the old. The population of the people over 80 years old will be 426 million in 2050, three times larger than that now.

Such robots could be especially useful for patients with Alzheimer’s disease（老年痴呆症）. They can help with everyday activities from preparing food to reminding the patients of taking their medicine. Such robots can also play games with patients to keep them active.

Some have worried that care-giving robots might reduce human communication and cause more humans to lose their jobs. “But the purpose is to support human care not to take the place of it,” says Brian Scassellati. He has tested robots with different patients, and found that daily communication with robots can help children with autism spectrum disorder（自闭症障碍） improve social skills.

As a field grows, scientists aim to understand human-robot relationships better. Do robots offer advantages because they don’t have feelings and don’t give opinions? Will patients lose interest?

“One thing is clear,” Scassellati says, “robots can provide care for the customers and the need for that will increase in the future.”