理工_类单选集考试卷模拟考试题

1、姓名：_ 班级：_ 学号：_-密-封 -线- 理工_类单选集考试卷模拟考试题考试时间：120分钟 考试总分：100分题号一二三四五总分分数遵守考场纪律，维护知识尊严，杜绝违纪行为，确保考试结果公正。1、arctic meltearths north and south poles are famous for being cold and icy. last year, however, the amount of ice in the arctic ocean fell to a record low.normally, ice builds in arctic waters around

2、the north pole each winter and shrinks during the summer. but for many years, the amount of ice left by the end of summer has been declining.since 1979, each decade has seen an 11.4 percent drop in end of summer ice cover. between 1981 and 2000, ice in the arctic lost 22 percent of its thickness, be

3、coming 1.13 meters thinner.last summer, arctic sea ice reached its skimpiest levels yet. by the end of summer 2007, the ice had shrunk to cover just 4.2 million square kilometers. thats 38 percent less area than the average cover at that time of year. and its a very large 23 percent below the previo

4、us record low, which was set just 2 years ago. this continuing trend has scientists concerned.there may be several reasons for the ice melt, says jinlun zhang, an oceanographer at the university of washington at seattle. unusually strong winds blew through the arctic last summer. the winds pushed mu

5、ch of the ice out of the central arctic, leaving a large area of thin ice and open water.scientists also suspect that fewer clouds cover the arctic now than in the past. clearer skies allow more sunlight to reach the ocean. the extra heat warms both the water and the atmosphere. in parts of the arct

6、ic ocean last year, surface temperatures were 3.5 warmer than average and 1.5 warmer than the previous record high.with both air and water getting warmer, the ice is melting from both above and below. in some parts of the beaufort sea, north of alaska and western canada, ice that measured 3.3 meters

7、 thick at the beginning of the summer measured just 50 centimeters by seasons end.the new measurements suggest that melting is far more severe than scientists have seen by just looking at ice cover from above, says donald k. perovich, a geophysicist at the u. s. army cold regions research and engine

8、ering laboratory in hanover, n. h.some scientists fear that the arctic is stuck in a warming trend from which it may never recover.which of the following is closest in meaning to the word “build” in the first sentence of the second paragraph （ ）a.constructb.extendc.created.expand2、arctic meltearths

9、north and south poles are famous for being cold and icy. last year, however, the amount of ice in the arctic ocean fell to a record low.normally, ice builds in arctic waters around the north pole each winter and shrinks during the summer. but for many years, the amount of ice left by the end of summ

10、er has been declining.since 1979, each decade has seen an 11.4 percent drop in end of summer ice cover. between 1981 and 2000, ice in the arctic lost 22 percent of its thickness, becoming 1.13 meters thinner.last summer, arctic sea ice reached its skimpiest levels yet. by the end of summer 2007, the

11、 ice had shrunk to cover just 4.2 million square kilometers. thats 38 percent less area than the average cover at that time of year. and its a very large 23 percent below the previous record low, which was set just 2 years ago. this continuing trend has scientists concerned.there may be several reas

12、ons for the ice melt, says jinlun zhang, an oceanographer at the university of washington at seattle. unusually strong winds blew through the arctic last summer. the winds pushed much of the ice out of the central arctic, leaving a large area of thin ice and open water.scientists also suspect that f

13、ewer clouds cover the arctic now than in the past. clearer skies allow more sunlight to reach the ocean. the extra heat warms both the water and the atmosphere. in parts of the arctic ocean last year, surface temperatures were 3.5 warmer than average and 1.5 warmer than the previous record high.with

14、 both air and water getting warmer, the ice is melting from both above and below. in some parts of the beaufort sea, north of alaska and western canada, ice that measured 3.3 meters thick at the beginning of the summer measured just 50 centimeters by seasons end.the new measurements suggest that mel

15、ting is far more severe than scientists have seen by just looking at ice cover from above, says donald k. perovich, a geophysicist at the u. s. army cold regions research and engineering laboratory in hanover, n. h.some scientists fear that the arctic is stuck in a warming trend from which it may ne

16、ver recover.what is the ice cover in the arctic by the end of 2007 summer （ ）a.4.2 million square kilometersb.11.4 million square kilometersc.1.13 million square kilometersd.38 million square kilometers3、arctic meltearths north and south poles are famous for being cold and icy. last year, however, t

17、he amount of ice in the arctic ocean fell to a record low.normally, ice builds in arctic waters around the north pole each winter and shrinks during the summer. but for many years, the amount of ice left by the end of summer has been declining.since 1979, each decade has seen an 11.4 percent drop in

18、 end of summer ice cover. between 1981 and 2000, ice in the arctic lost 22 percent of its thickness, becoming 1.13 meters thinner.last summer, arctic sea ice reached its skimpiest levels yet. by the end of summer 2007, the ice had shrunk to cover just 4.2 million square kilometers. thats 38 percent

19、less area than the average cover at that time of year. and its a very large 23 percent below the previous record low, which was set just 2 years ago. this continuing trend has scientists concerned.there may be several reasons for the ice melt, says jinlun zhang, an oceanographer at the university of

20、 washington at seattle. unusually strong winds blew through the arctic last summer. the winds pushed much of the ice out of the central arctic, leaving a large area of thin ice and open water.scientists also suspect that fewer clouds cover the arctic now than in the past. clearer skies allow more su

21、nlight to reach the ocean. the extra heat warms both the water and the atmosphere. in parts of the arctic ocean last year, surface temperatures were 3.5 warmer than average and 1.5 warmer than the previous record high.with both air and water getting warmer, the ice is melting from both above and bel

22、ow. in some parts of the beaufort sea, north of alaska and western canada, ice that measured 3.3 meters thick at the beginning of the summer measured just 50 centimeters by seasons end.the new measurements suggest that melting is far more severe than scientists have seen by just looking at ice cover

23、 from above, says donald k. perovich, a geophysicist at the u. s. army cold regions research and engineering laboratory in hanover, n. h.some scientists fear that the arctic is stuck in a warming trend from which it may never recover.what are the reasons for the ice melting according to the scientis

24、ts （ ）a.strong winds and clear skiesb.long summer and short winterc.open water and thin iced.light clouds and light winds4、arctic meltearths north and south poles are famous for being cold and icy. last year, however, the amount of ice in the arctic ocean fell to a record low.normally, ice builds in

25、 arctic waters around the north pole each winter and shrinks during the summer. but for many years, the amount of ice left by the end of summer has been declining.since 1979, each decade has seen an 11.4 percent drop in end of summer ice cover. between 1981 and 2000, ice in the arctic lost 22 percen

26、t of its thickness, becoming 1.13 meters thinner.last summer, arctic sea ice reached its skimpiest levels yet. by the end of summer 2007, the ice had shrunk to cover just 4.2 million square kilometers. thats 38 percent less area than the average cover at that time of year. and its a very large 23 pe

27、rcent below the previous record low, which was set just 2 years ago. this continuing trend has scientists concerned.there may be several reasons for the ice melt, says jinlun zhang, an oceanographer at the university of washington at seattle. unusually strong winds blew through the arctic last summe

28、r. the winds pushed much of the ice out of the central arctic, leaving a large area of thin ice and open water.scientists also suspect that fewer clouds cover the arctic now than in the past. clearer skies allow more sunlight to reach the ocean. the extra heat warms both the water and the atmosphere

29、. in parts of the arctic ocean last year, surface temperatures were 3.5 warmer than average and 1.5 warmer than the previous record high.with both air and water getting warmer, the ice is melting from both above and below. in some parts of the beaufort sea, north of alaska and western canada, ice th

30、at measured 3.3 meters thick at the beginning of the summer measured just 50 centimeters by seasons end.the new measurements suggest that melting is far more severe than scientists have seen by just looking at ice cover from above, says donald k. perovich, a geophysicist at the u. s. army cold regio

31、ns research and engineering laboratory in hanover, n. h.some scientists fear that the arctic is stuck in a warming trend from which it may never recover.why is the ice melting from both above and below （ ）a.because extra heat warms the air.b.because extra heat warms the water.c.because the temperatu

32、re above the water is higher.d.both a and5、arctic meltearths north and south poles are famous for being cold and icy. last year, however, the amount of ice in the arctic ocean fell to a record low.normally, ice builds in arctic waters around the north pole each winter and shrinks during the summer.

33、but for many years, the amount of ice left by the end of summer has been declining.since 1979, each decade has seen an 11.4 percent drop in end of summer ice cover. between 1981 and 2000, ice in the arctic lost 22 percent of its thickness, becoming 1.13 meters thinner.last summer, arctic sea ice rea

34、ched its skimpiest levels yet. by the end of summer 2007, the ice had shrunk to cover just 4.2 million square kilometers. thats 38 percent less area than the average cover at that time of year. and its a very large 23 percent below the previous record low, which was set just 2 years ago. this contin

35、uing trend has scientists concerned.there may be several reasons for the ice melt, says jinlun zhang, an oceanographer at the university of washington at seattle. unusually strong winds blew through the arctic last summer. the winds pushed much of the ice out of the central arctic, leaving a large area of thin ice and open water.scientists also suspect that fewer