2013年职称英语理工类C级完形填空试题及答案（四）

　　Avalanche and Its Safety

　　An avalanche is a sudden and rapid flow of snow， often mixed with air and water， down a mountainside. Avalanches are ____51____ the biggest dangers in the mountains for both life and property.

　　All avalanches are caused by an over-burden of material， typically snowpack， that is too massive and unstable for the slope ____52____ supports it. Determining the critical load， the amount of over-burden which is ____53____ to cause an avalanche， is a complex task ____54____ the evaluation of a number of factors.

　　Terrain slopes flatter than 25 degrees or steeper than 60 degrees typically have a low ____55____ of avalanche. Snow does not ____56____ significantly on steep slopes; also， snow does not ____57____ easily on fiat slopes. Human-triggered avalanches have the greatest incidence when the snow‘s angle of rest is ____58____ 35 and 45 degrees; the critical angle， the angle ____59____ which the human incidence of avalanches is greatest， is 38 degrees. The rule of thumb is： A slope that is flat enough to hold snow but steep enough to ski has the potential to generate an avalanche， regardless of the angle. Additionally， avalanche risk increases with ____60____; that is， the more a slope is disturbed by skiers， the more likely it is that an avalanche will occur.

　　Due to the complexity of the subject， winter travelling in the backcountry is never 100% safe. Good avalanche safety is a continuous ____61____， including route selection and examination to the snowpack， weather ____62____， and human factors. Several well-known good habits can also ____63____ the risk. If local authorities issue avalanche risk reports， they should be considered and all warnings should be paid ____64____ to. Never follow in the tracks of others without your own evaluations; snow conditions are almost certain to have changed since they were made. Observe the terrain and note obvious avalanche paths where plants are ____65____ or damaged. Avoid traveling below others who might trigger an avalanche.

　　51 A among B of C to D in

　　52 A when B that C who D whose

　　53 A mostly B likely C clearly D surely

　　54 A about B include C involving D contain

　　55 A weight B form C risk D work

　　56 A fall B flow C roll D gather

　　57 A fall B flow C roll D gather

　　58 A among B between C with D for

　　59 A at B of C in D on

　　60 A use B time C snow D rain

　　61 A journey B trip C fact D process

　　62 A conditions B reports C forecast D event

　　63 A increase B reduce C improve D remove

　　64 A price B effort C attention D money

　　65 A missing B grown C big D fresh

　　参考答案：

　　(51).

　　【正确答案】 A

　　(52).

　　【正确答案】 B

　　(53).

　　【正确答案】 B

　　(54).

　　【正确答案】 C

　　(55).

　　【正确答案】 C

　　(56).

　　【正确答案】 D

　　(57).

　　【正确答案】 B

　　(58).

　　【正确答案】 B

　　(59).

　　【正确答案】 A

　　(60).

　　【正确答案】 A

　　(61).

　　【正确答案】 D

　　(62).

　　【正确答案】 A

　　(63).

　　【正确答案】 B

　　(64).

　　【正确答案】 C

　　(65).

 　　【正确答案】 A  

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