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
21
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
ReadingPassage2hassixsectionsA-F.Choosethemostsuitableheadingsforse
食品原料的正确解冻方法是( )。A.室温下解冻 B.冷藏解冻 C.微波炉解
下列句子中名词作状语表示凭借的是()。A.君为我呼入,吾得兄事之。 B.太祖累
()部门负责为流动人口提供节育技术。A.计划生育部门 B.卫生部门 C.乡
A.急性血肿 B.亚急性血肿 C.梗死 D.水肿 E.慢性血肿TWI呈低
继唐太宗之后,武则天也大力提倡科举。有一年,她将应举的人集中到洛阳宫殿,亲自出题
我国证券公司应当接上一年营业费用总额的()计算营运风险资本准备。A:20%B:
A.药理作用 B.药物的使用 C.药物制剂因素 D.药动学相互作用 E.
关于环保税税目,正确的有( )。A.石棉尘属于大气污染物 B.建筑噪声属于噪
下面是三个磁动势的表达式,其中旋转磁动势是()。A. B. C. D.
最新回复
(
0
)