Humans can neither change the sun's radiation nor the earth's orbit around the sun. But they can control the increase in the amount of greenhouse gases and its effect on the atmosphere. Only during the last hundred years the carbon dioxide concentration has been raised alarmingly in the atmosphere and we humans can be held responsible for this.
The main cause of the increase in carbon dioxide level in the atmosphere is the burning of fossil fuels. Since the end of the 19th century, industrial activities increased rapidly giving rise to many factories. These factories required energy, which was produced through the combustion of coal. Besides coal, other resources of energy such as mineral oil and natural gas were also burned to heat our houses, run cars and airplanes or to produce electricity. Nowadays, about 85 million barrels of crude oil are burned daily. Every time a fossil raw material is burned, it releases carbon dioxide into the air.
Therefore, it is clear that more and more greenhouse gases like carbon dioxide are being generated worldwide by humans. Moreover, we are also strengthening the greenhouse effect by deforestation, which means cutting down trees. Every year enormous areas of forests are destroyed by people to obtain wood and to clear regions of mining and to create pasture. This loss of the forest causes dual problems. Trees that are burned up release large volumes of carbon dioxide gas into the air. On the other hand, as forests absorb a lot of carbon dioxide from the air and deliver oxygen instead, we also destroy an important storehouse of carbon dioxide when we clear forests.
(b) (iii) Burning
(c) (ii) damaged
(d) (iii) Deforestation
(e) (ii) rising carbon dioxide
(f) (i) brings about
(g) (iv) To show responsibility of human beings is strengthening greenhouse effect
(a) We are responsible for the increase of greenhouse gases because we burn fossil fuels and cut down forests. These activities release a large amount of carbon dioxide into the atmosphere.
(b) The main cause of the increase in carbon dioxide level is the burning of fossil fuels such as coal, mineral oil and natural gas. These are burned in factories, houses, vehicles and power plants.
(c) According to the text, about 85 million barrels of crude oil are burned daily. This releases carbon dioxide into the air and strengthens the greenhouse effect.
(d) Trees are called an important storehouse of carbon dioxide because forests absorb a lot of carbon dioxide from the air and give oxygen instead.
(e) We should reduce the burning of fossil fuels and stop deforestation. We should plant more trees and use energy carefully to keep the atmosphere normal for our living.
(b) climate
(c) rising
(d) used
(e) driving
| No. | Answer |
|---|---|
| (i) | 1953 |
| (ii) | was first surveyed by George Everest |
| (iii) | reached the top of Mount Everest |
| (iv) | Mount Everest |
| (v) | Hillary and Tenzing were recorded in the Guinness Book in 1956 |
(a) Education means the receiving of formal learning from any educational institution.
(b) The purpose of education is to enlighten the individual.
(c) Education frees a man from restriction.
(d) Education aims at removing the darkness.
(e) Education makes us conscious of our rights and responsibilities.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|
| g | d | a | c | h | e | b | f |
(a) By 'useless years' the poet means the years that have passed without meaningful work, achievement or noble contribution.
(b) The two mothers are different because one is poor and helpless, while the other is rich and comfortable. Their feelings for their children, however, are equally deep.
(c) The poet stopped by the woods because he was charmed by their beauty, darkness and silence.
(d) The weather was stormy and frightening when Mary went to bring the cattle home.
(e) Children should love, respect and obey their mother. They should also take care of her.
(f) The poet calls time an old gipsy man because time is always moving and never stays in one place.
(g) The poet has described the sea as vast, deep, powerful and restless.
(h) If time stays for a day, the poet can offer it songs, flowers and happy moments.
(a) Rosamond did not examine the jar because she was attracted by its beautiful colour and appearance.
(b) The rooster is called Mr. Moti because he is treated like an important and proud character in the story.
(c) Rosamond persuaded her mother to buy her a pair of shoes because her own shoes were worn out and uncomfortable.
(d) Portia's father made such a strange plan to choose a wise and worthy husband for his daughter.
(e) The milliner's shop looked attractive and full of beautiful things such as ribbons, flowers, feathers and fashionable articles.
(f) Portia saved Antonio's life by cleverly arguing in court that Shylock could take a pound of flesh but not a drop of blood.
(g) Three people attempted to choose the right casket. The Prince of Morocco and the Prince of Arragon failed, but Bassanio succeeded.
(h) Shylock got a bond signed by Antonio to take revenge on him if he failed to repay the borrowed money in time.
A Brave Act
Last Monday I went to bed at about 11 p.m. and slept a sound sleep. Suddenly I woke up at about 2 a.m. when I heard a hue and cry at a little distance. I got up from bed and saw that a cottage was burning. I shouted for help and ran towards the cottage.
Many villagers came out with buckets of water. The fire was spreading fast because the cottage was made of straw and bamboo. An old woman was crying and saying that her little grandson was still inside. Hearing this, I could not stand idle. I covered my face with a wet cloth and entered the cottage.
The room was full of smoke, but I heard the child crying. I found him near a corner and brought him out safely. The villagers then worked together and put out the fire after some time. The child was taken to a doctor and he became safe.
The old woman blessed me with tears in her eyes. I felt very happy because I could save a life. That night taught me that courage and quick action can save people in danger.
Rafi: Good morning, Abid. How are you?
Abid: Good morning. I am fine. What about you?
Rafi: I am fine too. I heard that you have little knowledge about computers.
Abid: Yes, that is true. I can do only a few basic things.
Rafi: You should learn computer properly. It is very important nowadays.
Abid: Why is it so important?
Rafi: Computers are used in schools, offices, banks, hospitals, business centres and almost every workplace.
Abid: That means computer skill is necessary for jobs too.
Rafi: Exactly. If you know computer, you can write documents, make presentations, use the internet and communicate easily.
Abid: It also helps students, doesn't it?
Rafi: Of course. Students can collect information, attend online classes and learn many things through computers.
Abid: You are right. I should start learning computer soon.
Rafi: That will be a wise decision. I can help you practise the basics.
Abid: Thank you very much. I will begin from this week.
Rafi: You are welcome.