Many years ago, most of our earth wascovered with blocks (块) of ice. These iceblocks were as tall as high buildings in modern cities. Most of the ice was inthe northern part of the world. Then the ice blocks started to move south. Coldand rain came with the ice. Animals had to move. At last, the ice began to melt(融化). After half a million years, most of it melted.More than half of the earth became covered with water. Theclimatebecame much warmer. Things began to grow. The earth began to look the way inwhich it looks today.

    We live on the earth. We use the sea around us. What do we take from the ocean? And what do we give to it?

    We take fishes from the ocean—millions of kilograms of fish, every year, to feed millions of people. {#blank#}1{#/blank#}We take minerals (矿物) from the ocean. We can get salt by evaporating (蒸发) seawater. {#blank#}2{#/blank#}such as gold. {#blank#}3{#/blank#}Seaweed (海草) becomes food of many kinds—even candy and ice cream—as well as medicine. Believe it or not, fresh water is another gift from the sea. We can't drink ocean water. {#blank#}4{#/blank#}But ocean water becomes fresh water when the salts are removed. In the future, we will find ourselves depending more and more on fresh water from the sea.

    The sea gives us food, fertilizer, minerals, water and other gifts. What do we give the sea? We pollute the ocean all the time. {#blank#}5{#/blank#}Throwing waste into the ocean is killing off sea life. Yet as the world population grows, we may need the sea and its gifts more than ever.

    We are finally learning that if we destroy our sea, we might also destroy ourselves. Hopefully, it is not too late.

The Terracotta Warriors, one of the eight wonders of the world, have enjoyed international fame. Located in Xi'an in northwest China's Shaanxi Province, they are warriors of the first-ever emperor in1China or Qin Shi Huang in Chinese, Ying Zheng.

Even though I knew they are life-sized sculptures (雕塑), I was still2 when I saw them. I was lucky enough to3 the pit (深坑) and take a close look at them for the first time.

They were made around 2, 200 years ago. When I first got down into the pit, the sculptures scared me4some of them lacked body parts.

I was told that the Terracotta Warriors are not easy to preserve (保存;保护) for over thousands of years. But to my surprise, they were actually5 in color when they were first discovered. However, the color fell off6after being exposed in the air.

The difficulty of preservation is one of the reasons why they have stopped7out other pits. Although the Terracotta Warriors are breathtaking, they are only part of the Mausoleum (陵墓) of the First Qin Emperor.

Shen Wenxi, an expert and museum librarian of the Chinese Academy of Social Sciences, told me there's an even grander area8 man-made mountains, rivers and seas inside the emperor' s underground palace.

However, there is no plan to dig them until there are perfect9of protecting and preserving them. Experts are still busy restoring the relics (修复文物) that were10in the 1970s.

For most students, stress (压力) is a fact of life. {#blank#}1{#/blank#} Instead, we should find ways to have a healthy life. Here is some advice. 

{#blank#}2{#/blank#}

Sometimes it can be difficult to say exactly what we're feeling. When we feel nervous or down, it can be useful to put our problems into words. For some of us, keeping a diary is a good way to relax. 

Breathe (呼吸) deeply and do some exercise. 

Breathing deeply will help us keep coal. Then doing some exercise can make a big difference to both physical and mental (精神上的) health. {#blank#}3{#/blank#}

Sit back and listen to the favorite music. 

Music has a wonderful influence on our feelings. When we feel sad, it fills our bears with warmth and comfort. {#blank#}4{#/blank#}When we grow nervous, it helps lower our stress. 

Don't take every trouble too seriously. 

Taking everything on shoulders and treating everything that goes badly as mistakes is a one-way ticket to having the bad feelings. {#blank#}5{#/blank#}

A. When we get angry, music keeps our minds clear

B. So, it's not a good idea to run away from it

C. Take it easy and it's believed that everything can be solved

D. It's difficult for us to do enough exercise.

E. Write down what makes us worried.

F. Keeping exercising at a certain time really helps us relax.

Robots are helpful to people's lives.They are able {#blank#}1{#/blank#}(help) people with a lot of housework. Also, they can work in restaurants, such as {#blank#}2{#/blank#}(send) food to people. But do you know that some robots can play {#blank#}3{#/blank#}part in repairing railways(修铁路)?

In Japan, engineers {#blank#}4{#/blank#}(build)a very special robot in 2022. The special robot can do difficult and {#blank#}5{#/blank#}(danger) work. In the past, workers sometimes {#blank#}6{#/blank#}(fall) from high places when they repaired railways.However, with the help of this kind of robot, workers  can be safe(安全的) and have more free {#blank#}7{#/blank#}.

Now, this kind of robot helps only in a few {#blank#}8{#/blank#}(place) in Japan. Engineers plan{#blank#}9{#/blank#}(improve) it and put it into full service by early 2024.

Think about what will happen in the future if we also have this kind of robot. I think this must be good news for many railway{#blank#}10{#/blank#}(worker).

Technology (技术)for space travel made our life on Earth better in many ways.Let's look at things we wouldn't have without space travel.

·Camera phones

In the 1990s NASA (美国国家航空航天局)made cameras small enough to fit on spacecraft.The technology is now used in cell phone cameras so that we can take selfies.

Sports shoes

There wouldn't be Nike Air trainers if we didn't go to space.The shock-absorbing(减震的) materials of the shoes come from space suits.

·Water cleaning system

In the 1960s,NASA created a technology to clean astronauts' drinking water.It is now widely used to clean water in swimming pools.

·Wireless (无线的)headset

Astronauts could easily get tangled up in wires,so NASA made wireless,hands-free headsets.

Astronauts can then move while talking and listening.

·Dust busters (手持吸尘器)

Astronauts hoped to collect samples on the moon.A company created a tool to help them do that.

The company then used this technology to make the dust buster in 1979.

·Computer mouse

In the past,you needed to type in codes(代码)in your computer to make it work for you.In 1968, a NASA researcher tried to make computers on spaceships easier to use,and this led to the creation of the mouse.