VII. Read the passages and choose A, B, C or D to indicate the correct answers to the following questions. One of the factor

VII. Read the passages and choose A, B, C or D to indicate the correct answers to the following questions.
One of the factors in global warming is carbon monoxide. The more carbon monoxide in the atmosphere, the less the atmosphere is able to clean itself. The result is a warming of the atmosphere, the so-called global warming, and possibly ozone damage.
Earlier, it was found that carbon monoxide was concentrated in the Southern Hemisphere, and could be attributed to deforestation. Huge areas of forest and grasslands in South America and Africa have been burned, putting carbon monoxide into the atmosphere. Recently, however, the Southern Hemisphere has been found to be clean, while the Northern Hemisphere is more polluted than expected.
The latest research was done during the northern winter. The high levels in the Northern Hemisphere could be because of this. In winter, carbon monoxide is destroyed more slowly. There are also more fires burned in winter, and possibly industrial processes work harder. It could also reflect the ever-increasing number of cars on the roads. Optimists hope that the reason why the North has overtaken the South as the major area of carbon monoxide is that at last the burning has stopped, or at least slowed down.
1. Which of the following is the best title for the passage?
A. Global warming B. Carbon monoxide in the atmosphere
C. The warming of the atmosphere D. Ozone damage
2. Which of the following is NOT a reason for carbon dioxide?
A. Ozone damage B. Burning of forest
C. Traffic D. Industry
3. According to the author which of the following is a reason why in winter there is more carbon-monoxide in the atmosphere?
A. Fewer factories are working.
B. There is a decrease in the amount of traffic on the roads.
C. Central heating means there are fewer fires nowadays.
D. Carbon monoxide is not absorbed so fast.
4. Why are the optimists happy?
A. People are buying more cars. B. There is more carbon dioxide in the North.
C. They are possibly burning fewer forests in the Southern Hemisphere. D. Industry must be doing better.
5. What is the attitude of the author towards the new findings?
A. He is biased in favor of the South. B. He is neutral.
C. He agrees with the optimists. D. He is worried about the North.