tailieunhanh - Toefl preparation for the computer and paper test part 63

The exercises are a vital part of the TOEFL preparation process presented in this text Maximum benefit can be obtained from the exercises if the students are properly prepared for the exercises and if the exercises are carefully reviewed after completion. | RECORDING SCRIPT 609 We ve discussed the groundhog which hibernates throughout the cold weather. Other animals that hibernate in a similar fashion are bats and squirrels. Now we ll look at the bear which hibernates in a different manner. Bears do not hibernate as completely as groundhogs bats or squirrels. In the southern half of the United States bears do not hibernate at all because the weather doesn t get cold enough for them to hibernate. In the northern half of the United States bears may not stay in hibernation for the entire winter. They may come out of their hibernation during the winter and wander about before returning to hibernation. A very important point that I d like you to understand is that hibernation is different from sleep and these differences between sleep and hibernation are seen in body temperature and heart rate. The main characteristics of hibernation which are very different from sleep are that body temperature and heart rate decrease significantly. When an animal comes out of hibernation the heart rate and body temperature increase to the levels normal during waking hours. During the period when a large animal such as a bear is coming out of hibernation the animal s entire body does not warm at once. The area around the heart warms up first. As the heart warms up it begins beating at its normal rate and it is then able to pump blood around the rest of the body and heat up the rest of the body. These are the main points that we need to cover about hibernation. Now we ll take a short break before moving on to the next subject. 21. WHAT IS NOT MENTIONED BY THE PROFESSOR AS A WAY THAT VARIOUS TYPES OF ANIMALS PREPARE FOR THE COLD WEATHER 22. WHAT IS NOT STATED IN THE LECTURE ABOUT GROUNDHOG DAY 23. WHICH OF THE FOLLOWING IS NOT A GOOD HIBERNATOR 24. WHAT HAPPENS TO BODY TEMPERATURE AND HEART RATE DURING HIBERNATION 25. WHAT PART OF THE BEAR WAKES UP FIRST FROM HIBERNATION Questions 26-30 narrator Listen to a lecture in a science class. The .