Scientists believe they now have scientific evidence to prove that ecosystems work better when there is a greater variety of species within them. This biodiversity is being lost destroying natural mechanisms that could repair the damage caused by man. 
      Findings show that losing plants and animals is not only reducing our quality of life but actually endangering our very existence. We cut down rich rainforests and replace them with one species plantations, such as pine and eucalyptus. We plough 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 and even damaged. Without their biodiversity, they are not able to serve as the natural cleaners of our planet. No longer are they able to absorb the carbon dioxide that is being produced in excess. The result is global warming, caused by the increase in the 'greenhouse effect', and ultimately, or even sooner, there will be a change in the world's climate. 
Question 36: Which of the following is the best title for the passage? 
      A. How Ecosystems Work Better                                     B. The Loss of Biodiversity 
      C. The Variety of Species                                                D. Natural Mechanisms 
Question 37: Which of the following is not a species used to replace a rich ecosystem?
      A. Herbs                               B. Pine                                 C. Eucalyptus                      D. Rye
Question 38: What is the purpose of paragraph 2? 
      A. To show natural mechanisms at work.                        B. To give examples of the loss of biodiversity
      C. To give example of variety of species.                        D. To show how ecosystems can work better.
Question 39: What, according to the passage, might be the final result of the simplification of natural ecosystems? 
      A. The basic processes are altered                                    B. There is a loss of biodiversity
      C. There is global warming                                              D. There is a change in the climate.
Question 40: The word "them" in paragraph 2 refers to __________. 
      A. Animals                           B. Plants                               C. rain forests                      D. species
Question 41: The word "Findings" in paragraph 2 is closest in meaning to ______.
      A. Expressions                     B. Information                     C. Inventions                       D. Excavation
Question 42: As used in paragraph 3, the word “absorb” could be beat replaced which of the following?
      A. take in                             B. draw back                        C. get rid of                          D. pay back
35. Đề thi thử THPTQG 2021 - Tiếng Anh - Chuyên Quang Trung - Bình Phước - L1 - có lời giải