更多"The saguaro, found in desert region"的相关试题:
[单项选择]Gourds were (introduced) to what is now the southwestern United States by (earliest) peoples (who) migrated north (from) Mesoamerica about 7000 years ago.
A. introduced
B. earliest
C. who
D. from
[单项选择]Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. (31) adaptation is to be light in color, and to (32) rather than absorb the sun’s rays. Desert mammals also depart from the normal mammalian practice of maintaining a (33) body temperature. (34) trying to keep down the body temperature deep inside the body, (35) would involve the expenditure of water and energy, desert mammals allow their temperatures to rise to what would normally be fever (36) , and temperatures as high as 46 degrees Celsius have been measured in gazelles (瞪羚羊).
Another strategy (37) large desert animals is to tolerate the loss of body water to a point (38) would be fatal for non-adapted animals. The camel can lose up to 30 percent of its body weight (39) water without harm to itseff, (40) human beings die after losing only 12 to 13 percent oftheir body weight.
A. react
B. reflect
C. reduce
D. repel
[单项选择]
Some desert animals can survive the summer heat and dryness because they are very unusual. The camel, for example, can experience and bear an increase in the temperature of its body and its blood of 9°C without anything bad happening to it. In addition, it can drink a lot of water at one time; then store enough water in parts of its body to supply its needs for two weeks or more. The kangaroo rat, on the other hand, gets all the water it needs from water that it produces when it breathes. However, most animals need to maintain a fairly constant body temperature, and will die if it rises more than 5°C. Therefore, they need to find some way to stay away from the heat of the summer sun. Nor can many animals either store or produce water in their bodies, as the camel and kangaroo rat can. So they must find ways to keep their bodies from losing water because of the heat. Because very few desert animals can survive the high temperature of a typical summer’s day, most of t
A. They only need a little food to survive
B. they are not afraid of the heat
C. They are too small to be attacked by other animals
D. they have a skin which is against water
[单项选择]第二篇 A Desert Between Paul and Clara
Paul had long promised to marry Clara．But at thirty thee he met and married Alice．Clara was driven mad．
Paul was taken to court．The judge ordered him to pay Clara$600 because of the broken promise．Paul had to borrow the money from a moneylender．He agreed to pay back$5 a month—for twenty years．His wages at the time were$16 a month．
Paul and Alice were poor but not unhappy．They had little enough food，certainly，even before the children began to arrive．Each month Paul paid$5 to the moneylender．He worked hard, never taking a holiday．In time，there were seven mouths to feed．
Illness was always with them．It grew serious when the oldest child was eight．The years of hunger weakened the family, because each month Paul paid$5．The details of the sickness were ugly, but the result was this：after twelve years of family life，Paul was alone in the world.
He lived alone．except for memories．Work was not now a god for him：it was a pain
A. poor but not sad．
B. very sick．
C. free from debt.
D. lonely and unhappy．
[单项选择]In the Arizona desert, tomatoes hang from ceilings, spinach grows without soil and shrimp lire in indoor pools. What’s going on.’ Food research!
People perform these experiments to learn how to produce more food. There will be over 6.5 bil- lion people on earth after two decades. We will have to produce four times as much food as we do now to feed all these people. But each year there is less fresh water, the soil loses nutrients and buildings take up more land. We must learn to use resources we have always thought unusable. So, the Environ- mental Research Laboratory in Arizona tries to grow food without soil, in the desert, and with salt water.
So far the results have been excellent. The new methods yield twenty times more tomatoes and cu-cumbers than can be grown on a farm. About sixty times as many shrimp can be raised in indoors pools than ten boats can catch in the ocean in a year. Crops can grow in salty soil. Plus, as they grow, they take salt and minerals from desert
A. people get hungrier every year
B. the population of the world is growing
C. there are too many unemployed farmers
D. people do not like the food now produced
