Республики казахстан национальный центр тестирования итоговая аттестация

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Чтение 1 текст Dolphins Dolphins are marine mammals closely related to whales. Along with whales, dolphins are descendants of above-ground mammals. There are almost forty species of dolphin are found worldwide. They are meat-eaters, eating mostly fish and squid. Dolphins are members of the family Delphinidae which evolved about ten million years ago. Doplhins' senses are very developed. Most dolphins have sharp eyesight, both in and out of the water, and they can hear frequencies ten times or more above the upper limit of adult human hearing. Hearing is also used for echolocation, which all dolphins have. Dolphin teeth are believed to function as antennae to receive incoming sound and to pinpoint the exact location of an object. Beyond locating an object, echolocation also provides the animal with an idea on the object's shape and size, though how exactly this works is not yet understood. The dolphin's sense of touch is also well-developed, with free nerve endings densely packed in the skin, especially around the snout, pectoral fins and genital area. However, dolphins lack an olfactory nerve and lobes, and thus are believed to have no sense of smell. They do have a sense of taste and show preferences for certain kinds of fish. Dolphins are capable of making a broad range of sounds using nasal air sacks located just below the blowhole. Individual dolphins communicate using a variety of clicks, whistle-like sounds and other vocalizations. The clicks are directional and are for echolocation, often occurring in a short series called a click train. The click rate increases when approaching an object of interest. Dolphin echolocation clicks are amongst the loudest sounds made by marine animals 1. Choose the correct answer: To make a broad range of sounds dolphins use …. A) sharp eyesight B) skin C) nasal air sacks D) their teeth E) sensitivity 2.Choose the correct answer: All dolphins have …. A) steam engine B) random selection C) temperature D) barometer E) echolocation 3.Choose the correct answer: Dolphins communicate with the help of …. A) printing B) vocalizations C) swimming D) negotiations E) interpretations 4. Choose the correct answer: The only sense dolphins don’t have A) sense of humor B) sense of smell C) sense of duty D) ability to see E) ability to hear 5. Choose the correct answer: Human … is ten times or more … dolphins ability. A) hearing/below B) speaking/high C) hearing/high D) seeing/very high E) listening/little жүктеу 0,59 Mb. Достарыңызбен бөлісу:

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