18. A. water B. smoke C. soil D. wind
II/ Read the passage, then choose the correct answer: (1m)
Most people are afraid of sharks, but they usually do not know very much about them. There are more than
350 kinds of sharks, and all of them are meat eaters. Sharks are useful because they eat sick fish and keep
the oceans clean. Sharks do not have ears. However, they can "hear" sounds and movements in the water.
Any sound or movement makes the water vibrate. Sharks can feel these vibrations, which help them find
food. They also use their large eyes to find food. Most sharks see best in dim 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, especially in 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.
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