Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. One adaptation is to be light in color, and to reflect rather than absorb the Sun’s rays. Desert mammals also depart from the normal mammalian practice ofmaintaining a constant body temperature. Instead of trying to keep down the body temperature deep inside the body, which would involve the expenditure of water and energy, desert mammals allow their temperatures to rise to what would normally be fever height, and temperatures as high as 46 degrees Celsius have been measured in Grant’s gazelles. The overheated body then cools down during the cold desert night, and indeed the temperature may fall unusually low by dawn, as   low as 34 degrees Celsius in the camel. This is an advantage since the heat of the first few hours of daylight is absorbed in warming up the body, and an excessive buildup of heat does not begin until well into the day.

Another strategy of large desert animals is to tolerate the loss of body water to a point that would be fatal for non-adapted animals. The camel can lose up to 30 percent of its body weight as water without harm to itself, whereas human beings die after losing only 12 to 13 percent of their body weight. An equally important adaptation is the ability to replenish this water loss at one drink. Desert animals can drink prodigious volumes in a short time, and camels have been known to imbibe over 100 liters in a few minutes. A very dehydrated person, on the other hand, cannot drink enough water to rehydrate at one session, because the human stomach is not sufficiently big and because a too rapid dilution of the body fluids causes death from water intoxication. The tolerance of water loss is of obvious advantage in the desert, as animals do not have to remain near a water hole but can obtain food from grazing sparse and far-flung pastures. Desert-adapted mammals have the further ability to feed normally when extremely dehydrated, it is a common experience in people that appetite is lost even under conditions of moderate thirst.

what does the author imply about desert- adapted mammals?

a.they do not need to eat much food 

b.they can eat large quantities quickly

c.they easily lose their appetites 

d.they can travel long distances looking for food

1. I didn’t lock the door. My cat went out and got lost.  (IF) 

2. The cruise ship returns to the Mersey on September 29th. It will depart from Liverpool for a fifteen-night Mediterranean cruise. (WHICH)

3. We need further information. We will not misunderstand the case. (ORDER)

4. Ruth ran very fast. She chould not catch up with Mark. (THOUGH) 

5. She acts like a boss. In fact, she isn’t. (AS IF) 

6. It is very dark inside. We could hardly see anything. (SO)

7. Jane was upset about having lost her wallet. It was understandable. (WHICH)

8. I start the engine. There is always a strange noise. (WHENEVER)

9. Sean’s flat was near enough for him to walk for work. He had no reason to take a taxi. (SINCE) 

1. Attractive ........... can help to sell products. (package)

2. What is the difference between "recycling paper" and "......... paper"? (recycle)

3. There has been some ........... in employment so far. (reduce)

4. The committee includes ........... from industry. (represent)

5. There has been some ........... unemployment. (reduce)

6. ........ also plays central role in traditional medicine. (prevent)

7. Finding suggest that while television is more ....... than the press, it is less persuasive. (inform)

8. It can be ....... to write a short summary of your agrument first. (use)

9. The next ....... for New York will be 11.00. (depart)

10. The ......... of Flight 106 from Boston has been delayed. (arrive)

11. The hotel is ...... comfortable. (wonder)

12. My family live in a northern ........ region. (mountain)

13. He received the award in ......... of his success over the past year. (recognize)

14. Flights should be comfirmed 48 hours before ......... (depart)

15. We apologize for the late ...... of the train. (arrive)

Cảm mơn mọi người đã giúp đỡ. 🙆❤

Choose the correct answer:

1. What time_________tomorrow? ( will the train leave/is the train leaving/ does the train leave/ is the train going to leave)

2.__________ don't visit this part of the town. ( Most tourists/ Most of tourists/ the most tourists/ many tourists)

3.Tom can't remember________ the telephone number down. ( write/ to write/ writing/ written)

4. The coffee_______ by the time I got up this morning. ( was already made/ had already been made/ has already been made/ would have already made)

5. Please share your cake_____ others. ( to/ for/ with/ among)

6. If it______ next Sunday, we'll stay at home. ( will rain/ rains/ rained/ would rain)

7. But for your help, we_____ in trouble. ( will be/ would be/ would have been/ had been)

8. John will miss his bus _____ he leaves now. ( if/ unless/ when/ untill)

9. The paper has_____ good news today. ( a/ an/ the/ some)

10. Their best player is______ to leave for Chealsea. ( on the point/ looking forward/ planned/ about)