[单项选择]South American flamingos can survive in temperatures （） above the freeing point.
A. that fewer degrees
B. if few degrees
C. only a few degrees
D. when fewer degrees

[单项选择]South American flamingos can survive in temperatures ______ above the freeing point.
A. that fewer degrees
B. if few degrees
C. only a few degrees
D. when fewer degrees

[填空题]Because American cellphone users can choose either the prepaid service or pay as you go, cellphone subscribers have increased in number.

[单项选择]The origin of the American party system can be traced to ______.
A. the struggle between the Royalists and revolutionaries in the War of Independence
B. the constitutional debate between the Federalists and the anti-Federalists
C. the struggle between those who upheld slavery and those who opposed slavery
D. none of the above

[简答题] can survive in droughtenvironment

[填空题]What Is An American "I can’t make you out, "Herry James has Mrs. Tristram say to the American, "whether you are very simple or very deep. "This is a (1) ______ [1] ______ which has confronted Europeans. What is it then that makes Americans (2) ______ wherever they go [2] ______ We hope it is not the unpleasant impression made by some tourists. Americans carry an appearauce which is more a result of attitude than of clothing. This attitude combines a lack of class (3) ______ , an optimism [3] ______ and an inquisitiveness. Also a liking for facts and figures, an (4)______ [4] ______ and above all a desire to be friendly. Americans are a (5)______ people. They work like mad then give away [5] ______ what they earn. They play until they are exhausted, and call this a (6) [6] ______ ______They like to think of themselves as average men. They tell each other "Take it easy", while always rushing

[填空题]What are the two things that American people can’t avoid ______ and______.

[填空题]The leaves of evergreens can survive the winter because they are ______and fluid inside their cells contains cold-resisting substances.

[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. Desert Animals and Insects
B. Kangaroo Rat and Camel
C. The Climate in Desert
D. Desert Plants