Kì thi học sinh giỏi cấp trường môn tiếng Anh khối 10 (2007-2008)

. Most people are afraid of sharks, but they usually do not know much about them. For example, there are 350 kinds of sharks, and all of them are meat eaters. Some sharks are very big. The whale sharks is 50 to 60 feet long. But some sharks are very small. The dwarf shark is only 6 inches long. Sharks are 100 million years old. In fact, they lived at the same time as dinosaurs. Today, sharks live in every ocean in the world, but most sharks live in warm water They keep the oceans clean because they eat sick fish and animals. Most sharks have four to six rows of teeth. When a shark’s tooth falls out another tooth moves in from behind. Sharks do not have ears. However, they “hear “ sounds and movements in the water. Any sound or movement makes the water vibrate. Sharks can feel these vibrations, and they help the sharks find food. Sharks use their large eyes to find food, too. Most sharks see best in low light. They often hunt for food at dawn, in the evening, or in the middle of the night. Scientists want to learn more about sharks for several reasons. For example, cancer is common in many animals including people. However, it is rare in sharks. Scientists want to find out why sharks almost never get cancer. Maybe this information can help people prevent cancer too.

. Most people are afraid of sharks, but they usually do not know much about them. For example, there are 350 kinds of sharks, and all of them are meat eaters. Some sharks are very big. The whale sharks is 50 to 60 feet long. But some sharks are very small. The dwarf shark is only 6 inches long. Sharks are 100 million years old. In fact, they lived at the same time as dinosaurs. Today, sharks live in every ocean in the world, but most sharks live in warm water They keep the oceans clean because they eat sick fish and animals. Most sharks have four to six rows of teeth. When a shark’s tooth falls out another tooth moves in from behind. Sharks do not have ears. However, they “hear “ sounds and movements in the water. Any sound or movement makes the water vibrate. Sharks can feel these vibrations, and they help the sharks find food. Sharks use their large eyes to find food, too. Most sharks see best in low light. They often hunt for food at dawn, in the evening, or in the middle of the night. Scientists want to learn more about sharks for several reasons. For example, cancer is common in many animals including people. However, it is rare in sharks. Scientists want to find out why sharks almost never get cancer. Maybe this information can help people prevent cancer too.