Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. I am sure you have heard about global warming. Global warming may make the sea level become higher. Do you know why? It is because global wanning causes the earth to be warmer and this in turn makes glaciers melt. What is a glacier? It is a large sheet of ice that moves very, very slowly. Some melting glaciers add more water to the ocean. Higher temperatures also make water expand. When water expands in the ocean, it takes up more space and the level of the sea rises. Coastal flooding could cause salt water to flow into areas where salt is harmful, threatening plants and animals in those areas. Leaders of all nations around the world are in the fight against global warming but "change only happens when individuals take action. Question 18. Global warming may make the level of the sea become _________. A. higher B. hotter C. lower D. warmer Question 19. How fast does a Racier move? A. very fast B. very slowly C. very rapidly D. very quickly Question 20. What does water expand, according to the passage? A. Because of plants and animals. B. Because of leaders of all nations around the world. C. Because of higher temperatures. D. Because of individuals. Question 21. What will be threatened if salt water flows into areas where salt is harmful? A. Trees and animals in those areas. B. Buildings in those areas. C. Glaciers in those areas. D. Rivers in those cars Question 22. Which of the following statements is NOT TRUE, according to the passage? A. Water expands because of higher temperatures. B. A glacier is a large sheet oi ice that moves very fast. C. Global warming may make the sea level become higher. D. Leaders of many countries in the world arc fighting against global warming.