首页
登录
职称英语
Here in the United States, before agricultural activities destroyed the nat
Here in the United States, before agricultural activities destroyed the nat
游客
2023-12-01
31
管理
问题
Here in the United States, before agricultural activities
destroyed the natural balance, there were great migrations of Rocky
Mountain locusts(蝗虫). Great migrating hordes of these insects
once darken the skies on the plains east of the Rockies where crops【S1】______
were often destroyed; the worst years were those between 1874 to【S2】______
1877. One of these migrating swarms was estimated to contain 1. 24
billion locusts. During the another migration in Nebraska it was【S3】______
estimated that the swarm of locusts averaged half a mile high and
was 100 miles wide and 300 miles long. Usually, these swarms take
up from the ground against the wind, but, once airborne, they turn【S4】______
and fly with it. Warm convection currents(对流)help to lift them,
often at great heights. During the great locust plagues the situation【S5】______
in Nebraska became so serious that the original state constitution
had to be rewritten to take care the economic problems. The new【S6】______
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, that is still common there. In this respect,【S7】______
the North American migratory locusts resemble their African
relatives. In both regions the migratory forms rise as a result of【S8】______
crowding and climatic factors. Migratory forms are apparently
natural adaptations which bring about dispersal when locust
populations become too crowded. Unfortunately for our farmers, the【S9】______
migratory form 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
migratoiy form might not again appear if circumstances become【S10】______
favorable. [br] 【S9】
选项
答案
Unfortunately—Fortunately
解析
语义错误。结合文章,蝗虫群的迁徙不那么频繁对农场主们来说是件幸事,所以应改成Fortunately。
转载请注明原文地址:https://tihaiku.com/zcyy/3234060.html
相关试题推荐
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
HowtoPrepareforaScholarshipInterview?I.Beforetheinterview—Preparatio
TherearefourmajortypesofbenchmarkingactivitiespursuedatXerox;int
TherearefourmajortypesofbenchmarkingactivitiespursuedatXerox;int
随机试题
December1,2014De
[originaltext]W:IhadareallystrangeexperiencewhileIwaswalkingaroundo
PartⅡReadingComprehension(SkimmingandScanning)Directions:Inthispart,y
Mostpeoplehaveanintuitive【C1】______ofwhatintelligenceis,andmanywor
汽车客运站,旅客安全检查方法不包括()A.X光安检机 B.探测检查门 C.磁
临终照顾的目的是A.同情病人 B.实现无苦而终 C.治疗疾病 D.延长生命
慢性宫颈炎的病因是()。A.人乳头瘤病毒 B.性伴侣不稳定 C.宫颈受损后
在生物地球化学循环层次上,根据哪项依据分类可将循环分为气相循环、液相循环和固相循
下列属于培训成果评估的重要指标的有()A:学习成果 B:认知成果 C:技能成
下列资金来源中,能够形成政策性银行负债的是()。A:长期性建设国债B:直接吸纳
最新回复
(
0
)