A. ANSWER B. CALCULATE C. SOLVE D. EXPLAINII. READ THE PASSAGE BEL...

45. A. answer B. calculate C. solve D. explainII. Read the passage below and choose the best answer (A, B, C or D) to each question. Scientists believe they now have scientific evidence to prove that ecosystems work better when there is a greatervariety of species within them. This biodiversity is being lost destroying natural mechanisms that could repair the damagecaused by man. Findings show that losing plants and animals is not only reducing our quality of life but actually endangering our veryexistence. We cut down rich rain-forests and replace them with one species plantations, such as pine and eucalyptus. Weplough up meadows rich in different grasses and herbs and replace them with one grass, for instance rye or wheat. When a natural ecosystem is simplified the basic processes in the ecosystem are altered arid even damaged. Withouttheir biodiversity they are not able to serve as the natural cleaners of our planet. No longer are they able to absorb the carbondioxide that is being produced in excess. The result is global warming, caused by the increase in the "greenhouse effect", andultimately, or even sooner, there will be a change in the wprld's climate.