Life in the 22nd century will be different from life in the 21th century，because many changes will take place in the new century. But what will the changes be?
The population(人口) is   1  fast．There will be more and more people in the world and most of them will live   2  than before．  3  will be much smaller and more useful，and there will be at least one in every home．And computer studies will be one of the important subjects at   4 ．
People will work fewer hours than they did in the 21th century，and they will have more free time for sports，  5  TV and traveling．Traveling will be more  6  . And many more people will go to other countries for holidays．
More land will be used for building new towns and houses．Then there will be less room for cows and sheep，so    7   will be more expensive．Maybe no one will eat it every day，  8 they eat more vegetables and fruit．Maybe people will be healthier．
Work in the future will be    9 ，too．Dangerous and hard work will be done by robots(机器人)．  10  of this，many people will not have enough work to do．This will be a problem．

We all enjoy the beautiful show of colours as leaves change each autumn. But did you ever wonder how and why this happens?
Leaves are nature’s food factories. Plants take water from the ground through their roots and take carbon dioxide (二氧化碳) from the air. Plants use sunlight to turn water and carbon dioxide into glucose (葡萄糖). Glucose is a kind of sugar, which plants use as food for energy and growing.
The way plants turn water and carbon dioxide into sugar is called photosynthesis that means “ putting together with light”. A chemical called chlorophyll helps photosynthesis. It gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter, and trees “know” to begin getting ready for winter.
During winter, there is not enough light or water for photosynthesis. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food-making factories.
As the green chlorophyll disappears from the leaves, we begin to see yellow and orange leaves. Small amounts of these colours have been in the leaves all along. We just can’t see them in the summer, because they are covered up by the green chlorophyll.
The bright reds and purples we see in leaves are made mostly in autumn. In some trees, like maples (枫树), glucose is caught in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn turn this glucose into a red colour. The brown colour of trees like oaks (橡树) is made from waste left in the leaves.
It is the mixture of all these things that makes the beautiful colours we enjoy during autumn.
【小题1】The word “chlorophyll” in the third paragraph means _______ in Chinese.

Once upon a time , there was a child ready to be born. So    16  he asked God, “They tell me you are sending to    17 , but being so small and helpless,    18  am I going to live there?”
“   19   the many angels(天使), I chose the best one for you. She will be waiting for you and will take care of you. ” God replied.
“But here in heaven(天堂), I do    20    else but sing and smile! That’s enough for me to be happy.”
God said, “Your angel will sing and smile for you every day. And you will feel your angel’s love and you’ll be   21 .”
The child said, “And how am I going to be able to understand when people talk to me   22   I don’t know the language that men speak?”
God told the child, “ Your angel will tell you the most beautiful and sweetest words you will ever hear, and with     23   patience(耐心) and care, your angel will teach you   24  .
The child said, “I’ve    25   that on the earth there are bad men, who will protect me?”
God said, “Your angel will protect you  26  it means risking her life(冒生命危险).”
“But I will always be sad because I will not see you any more.”
“Your angel will always talk to you about    27  and in face, I will always be next to you.”
At the momen0t there was much peace in Heaven, but voices from the earth could already be heard, and the child, in a hurry, asked, “ Oh , God, since I am about to    28  now, please tell me my angel’s    29   !”
“It is not hard to remember,” God replied    30 . “You will call your angel Mommy.”

We all need to exercise. Doctors say it is good for us. It makes your heart and body strong. It also gives you more energy. And you will feel better yourself. It’s best to exercise twice a week. Twenty minutes each time is enough.
There are many ways to exercise. You can walk, run, play sports, or swim. Many people go to special places to exercise. They are called “fitness centers”. These places have a lot of equitment. Some people buy equitment for their homes. But it is very expensive.
Exercising can be fun. Friends can exercise together at fithess center. Or they can play sports together, how do you exercise?
【小题1】What is the main idea?