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【单选题】

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1个最佳答案。
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 ers 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, (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 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.
Duc 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 () 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.
increase
B.
reduce
C.
improve
D.
remove
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【单选题】利率互换中固定利率一般选择()的利率。

A.
双方协商而定
B.
使互换初始价值为0
C.
选取的参照利率的即期
D.
使互换初始价值最大

【多选题】以下选项符合待配母猪的有()。

A.
后备母猪
B.
后备母猪首次配种后发生妊娠中断后
C.
哺乳母猪断奶后
D.
妊娠母猪妊娠中断后

【多选题】下列选项中,( )符合《劳动法》对女工特殊保护的规定。

A.
根据妇女生理特点组织劳动就业,实行男女同工同酬
B.
禁止安排女职工从事矿山井下劳动
C.
禁止安排女职工从事国家规定的第四级体力劳动强度的劳动
D.
不得安排女职工从事有毒有害劳动
E.
用人单位应当对女职工定期进行健康检查

【单选题】下列各选项正确的是( ).

A.
若收敛
B.
若都收敛
C.
若正项级数
D.
若级数收敛,且an≥bn(n=1,2,…),则级数也

【单选题】下列选项中不是甲亢的临床表现()

A.
周期性麻痹
B.
周围血管征
C.
月经量过多
D.
肌无力及肌萎缩
E.
大便次数增多