2014年职称英语考试《理工类A级》冲刺试卷(二)

阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择l个最佳答案，涂在答题卡相应的位置上。

51、回答51-65题：
Avalanche and Its Safety
An avalanche is a sudden and rapid flow of snow, often ________________________ (51) with air and water, down a mountainside．Avalanches are among the biggest dangers in the mountains for both life and property.
All avalanches are ________________________ (52) by an over-burden of material, typically snowpack that is too massive and unstable for the slope that supports it．Determining the critical load, the________________________ (53) of over-burden which is likely to cause an avalanche, is a complex task involving the evaluation of a number of factors.
Terrain slopes flatter than 25 degrees or steeper than 60 degrees ________________________ (54) have a low ________________________ (55) of avalanche．Snow does not________________________ (56) significantly on steep slopes: also, snow does not________________________ (57) easily on flat 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 at which the human incidence of avalanches is greatest is 38 degrees．The rule of thumb is: A slope that is________________________ (59) 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 of 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.

A．mixed
B．mixing
C．mixes
D．have mixed


52、
A．increased
B．caused
C．removed
D．encountered


53、
A．clearly
B．likely
C．typically
D．surely


54、
A．deal
B．amount
C．number
D．much


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．thick
B．thin
C．flat
D．rocky


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