ax A. lots D. much C) many D. plany Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions. TSUNAMIS Tsunamis are waves but they are far different from normal waves that occur every day in the ocean. A normal wave is created by the pull of the moon's gravity, but tsunamis are a series of great sea waves that are created by a shock from underwater. The most common causes of tounamis are underwater earthquakes landslides, or volcanic eruptions. On Sunday, 26^th December,2004, a 9.0-magnitude earthquake occurred under the Indian Ocean near the west coast of the Indonesian island of Sumatra. It displaced a large amount of water,and sent shock waves in every direction, resulting in a series of 30-foot waves travelling up to 500 miles per hour. These high speeds cause the waves to be very destructive. They travelled unnoticed at first because they were not visible an the surface, a common pattern in the occurrence of tsunamis. 28. Which of the following best expresses the main idea of the passage? A. Normal waves and tsunamis. B. Characteristics of ocean waves. C. How a tsunami is caused. D. How to predict a tsunami. 29. According to the passage, what can create a tsunami? A. Shocks that occur underwater. B. The pull of the moon's gravity. C. A large rock dropping into the ocean. D. It is not known.