首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Here in the United States, before agricultural activities destroyed the natural balance, there were great migrations of Rocky Mo
Here in the United States, before agricultural activities destroyed the natural balance, there were great migrations of Rocky Mo
admin
2013-10-17
81
问题
Here in the United States, before agricultural activities destroyed the natural balance, there were great migrations of Rocky Mountain locusts (Melanoplus spretus). Great migrating hordes of these insects once darkened the skies on the plains east of the Rockies where crops were often destroyed; the worst years were those from 1874 to 1877. One of these migrating swarms was estimated to contain 124 billion locusts. During another migration in Nebraska it was estimated that the swarm of locusts averaged half a mile high and was 100 miles wide and 300 miles long. Usually, these swarms take off from the ground against the wind, but, once airborne, they turn and fly with it. Warm convection (对流) currents help to lift them, often to great heights. During the great locust plagues the situation in Nebraska became so serious that the original state constitution had to be rewritten to take care of the economic problems. The new document was known as "The Grasshopper Constitution". It is now believed that these locusts were a migratory form or phase of the lesser migratory locust, which is still common there. In this respect, the North American migratory locusts resemble their African relatives. In both regions the migratory forms arise as a result of crowding and climatic factors. Migratory forms are apparently natural adaptations which bring about dispersal when locust populations become too crowded.
Fortunately for our farmers, the migratory form—the so called spretus species—no longer seems to occur regularly, although there was a serious outbreak as late as 1938 in midwestern United States and Canada. Actually, there is no reason why the destructive migratory form might not again appear if circumstances should become favorable.
It can be inferred from the passage that the state constitution of Nebraska was rewritten in order to______.
选项
A、make the constitution more understandable to the public
B、encourage farmers to leave the state
C、solve difficulties that resulted from loss of crops
D、provide for a regular census of the locust population
答案
C
解析
文中第七句说:“在蝗灾严重期间,内布拉斯加州的情况变得非常糟糕,以至于为了解决经济问题,原来的州宪法不得不被修改。”这里所指的经济问题显然是由蝗灾造成的庄稼的损失引起的,所以答案应为C。
转载请注明原文地址:https://kaotiyun.com/show/L8XO777K
0
在职攻硕英语联考
相关试题推荐
Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,therefore,thechoiceofa(n)【C1】______shouldbemad
Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,therefore,thechoiceofa(n)【C1】______shouldbemad
Duringrecentyearswehaveheardmuchabout"race":howthisracedoescertainthingsandthatracebelievescertainthingsand
Thequestionofwhetherwarisinevitableisonewhichhasconcernedmanyoftheworld’sgreatwriters.Beforeconsideringthis
Thenotionthatinanimateobjectsaresubjecttotheirownexperiencemaysoundabsurd;anditis.However,thereasontodismis
Treesshouldonlybeprunedwhenthereisagoodandclearreasonfordoingsoand,fortunately,thenumberofsuchreasonsiss
Ascientificlawisliableatanytimetoneed______;thatisaneternaltruth.
Althoughmissileagencyofficialssaythenewkillvehicleisreliable,someoutsideexpertsareskeptical.
Thelawisagreatmassofrules,showingwhenandhowfaramanisliabletobepunished,ortobemadetohandovermoneyorp
Thelawisagreatmassofrules,showingwhenandhowfaramanisliabletobepunished,ortobemadetohandovermoneyorp
随机试题
行政令正文的三部分分别为:命令原由、命令事项和()
求函数y=x3-2x2的单调区间、极值及此函数曲线的凹凸区间和拐点.
女,29岁,咳嗽、黄痰,黏稠伴高热(体温39℃),周身不适2天,曾肌注氟美松及抗感冒剂,热退,第4天右胸吸气性疼痛,体温升至39.5℃,顿咳,痰有异味,X线胸片:右下肺高密度片状影不应首先做哪项检查
A.急性肾盂肾炎B.急性膀胱炎C.膀胱肿瘤D.肾结核E.输尿管下段结石
某屋外变电站的330kV配电装置内,设备间连接线采用双分裂软导线,其双分裂软导线至接地部分之间最小安全距离可取()。
安全网筋绳分布必须合理,相邻两根筋绳的最小建筑施工与高处作业安全距离不得小于多少?()
使用价值指物的______,即物能够满足人们某种需要的属性。它是商品的自然属性,构成社会财富的物质内容,体现人与自然的关系。
统计调查按()可分为直接调查、凭证式调查、询问式调查。
赵某死亡后,甲依遗嘱继承了一套房屋(价值180万元),乙依遗赠分得一幅字画(价值40万元),丙依法定继承分得现金60万元。遗产分割完毕后,赵某的债权人找到甲、乙、丙,要求偿还欠款40万元。该欠款应()。(2014年一专一第36题)
2010年3月15日,甲与乙达成买卖协议,约定甲向乙出售孤本线装古书一套(该套书分为上中下三卷),价款15万元,双方应于同年8月9日同时履行。2010年5月30日,甲在搬家过程中不慎将该套书的中卷本丢失。甲第二天在报纸上刊登寻物启事,称归还此书者可得酬金5
最新回复
(
0
)