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  3. 共用题干 Avalanche and Its SafetyAn avalanc

共用题干 Avalanche and Its SafetyAn avalanc

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问题 共用题干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 un-
stable for the slope. __________(52)supports it.Determining the critical load,the amount of over-burden
which is
______ (53)to cause an avalanche,_________(54)a complex task involving 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 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 an-
gle.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 evalua-
tions;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.
选项 _________(51)A:amongB:ofC:toD:in
答案A
解析表达“雪崩是山上可能发生的最大危险之一”的意思。among在······之中。 此处需要一个关系代词，代替slope，所以，that是正确选项。 A不合语法，C、D不合常识，过度的雪的积压可能导致雪崩而不是必定导致雪崩。故 选B。 该句的主语是determining the critical load，故谓语用第三人称单数形式，再从上下文可 知应使用一般现在时。 可用排除法，A、B、D与前后文在语意上不搭配。a low risk of avalanche（低雪崩概率）在 下文也得到了证实。 第56题和第57题应一并考虑。这里是说：在陡峭的坡面上，雪不会大量堆积，在较为 平坦的坡面上，雪不会轻易滑动。 见56题解释。 雪的支撑物的角度在35°～45°之间时，最可能发生人为触发的雪崩。 这里是说足够平坦得以存雪同时又足够陡峭能够滑雪的山坡有可能发生雪崩，flat是 “平坦”的意思。 空后的that is表明，后半部分是对前半部分的进一步说明。所以要根据下文的意思判 断。use是最佳的选择。 从全段的内容判断，只有process是最佳选择，因为该段描写的是如何防备雪崩，以及做 好安全措施等一系列问题。 根据上下文判断可知A是正确答案。这里指核查天气状况。 选项A不符合句子的意思；选项C不能和risk搭配;D也不符合句子的意思，不可能完 全消除雪崩。 这里是pay attention to的被动形式。 该句是作者给出的一系列忠告之一，即，认真观察地形，注意明显的雪崩路径：没有植物或植物被毁坏的地方。
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