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
2023-11-29
84
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/3228187.html
相关试题推荐
SuggestionsofReadingActivitiesI.Three【T1】______phase
SuggestionsofReadingActivitiesI.Three【T1】______phase
SuggestionsofReadingActivitiesI.Three【T1】______phase
SuggestionsofReadingActivitiesI.Three【T1】______phase
SuggestionsofReadingActivitiesI.Three【T1】______phase
SuggestionsofReadingActivitiesI.Three【T1】______phase
SuggestionsofReadingActivitiesI.Three【T1】______phase
SuggestionsofReadingActivitiesI.Three【T1】______phase
TheUnitedStatesproducedmorecrudeoilinOctoberthanitimportedforth
TheUnitedStatesproducedmorecrudeoilinOctoberthanitimportedforth
随机试题
(16)______[br](22)______[originaltext]TherearethreeofusinPersonnel
______thedesertislikeasea,______isthecamellikeship.A、What...asB、As...
[originaltext]M:Canwemakeyouanoffer?Wewouldliketorunthecampaignfo
某办公楼,建筑高度为88m,首层室内标高为±0.000m,屋顶高位水箱最低有效水
养阴清肺汤主治证的病因病机是A.痰热内蕴,复感风寒B.燥热伤肺,灼津成痰C.肺胃
Iknowpeoplewhofinditpracticallyim
关于生理依赖性的叙述不正确的是A.中断用药后可产生一种强烈的躯体方面的损害,即戒
尝试一错误说的提出者是( )。A、桑代克 B、巴甫洛夫 C、斯金纳 D、
某建筑场地覆盖层厚度为8.0m,设计基本地震加速度为0.30g,设计地震分组为第
属于动力性肠梗阻病因的是 A.肠系膜血栓形成B.慢性铅中毒C.肿瘤压迫肠管
最新回复
(
0
)