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职称英语考试:理工C模拟试题(6)

2010-07-12 14:20  来源:     我要纠错 打印 收藏   

    六、完型填空。

    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

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