A. ENCOURAGE B. FORCE C. DISCOURAGE D. RECOMMEND(76-80). READ THE...

75. a. encourage b. force

c. discourage

d. recommend

(76-80). Read the passage below carefully and choose the correct answer a, b, c or d.

Scientists believe that something very serious is happening to the Earth. It is becoming

warmer. Scientists predict that there will be major changes in the climate during the

21st century. Coastal water will have higher temperatures. This will have a serious affect

on agriculture. Farmer will have trouble producing good crops. In warm regions the

weather will be too dry. The amount of water could decrease by 50 percent. This would

cause a large decrease in agricultural production.

World temperature could increase from 1.5 to 5.6 degrees Celsius by the middle of the

21st century. And the increase in, temperature could be even greater in the Arctic and

Antarctic regions. A rise in temperature could cause the great ice sheets to melt, which, in

turn would raise the level of the oceans by one to two meters. Many coastal cities would

be underwater. Why is all this happening?

The Earth and its atmosphere are kept warm by the Sun. The atmosphere lets most of the

light from the Sun pass through to warm the Earth. The Earth is warmed by the sunlight

and sends heat energy back into the atmosphere. Much of this energy escapes from the

Earth’s atmosphere. However, some of it remains. Gases such as carbon dioxide, ozone

and water vapor absorb this energy and create more heat. Then this heat is sent back

down to Earth, and the Earth becomes warmer.