Exercise 4. Mark the letter A, B, C, or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
46. Fresh water is very important to life because no one can live without it. Yet it is one of the limited and most endangered natural resources on our planet.
A. Clean B. Drinkable C. Polluted D. Running
47. One way to protect our environment from pollution is to reduce wasteful consumption.
A. costly B. excessive C. safe D. economical
48. If you follow at least one of the tips, you can be proud of taking part in the preservation of water, one of the very important and limited natural resources on earth.
A. self-confident B. self-satisfied C. discontent D. unpleasant
49. Soil pollution leads to lack of fertile land to grow enough food for an increasing population.
A. arid B. rich C. unclean D. deserted
50. Global warming may lead to many negative changes, including harsher weather conditions.
A. more unbearable B. milder C. more extreme D. more scrious
