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
42
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] 【S5】
选项
答案
at—to
解析
介词误用。这句话要表达的意思是“温暖的对流经常会帮它们上升到非常高的高度。”at...height表示“在……高度”,而在这里要使用to表示lift这一动作的目的或结果。
转载请注明原文地址:https://tihaiku.com/zcyy/3234056.html
相关试题推荐
MembershipinlaborunionsintheUnitedStatesreacheditspeakof17millions
AntiqueauctionshavebecomepopularintheUnitedStatesbecauseasteadilyinc
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
随机试题
WhatisPET?TheCambridgePreliminary(预备的)EnglishTest(PET)isthesecond
Itseemsnecessarythatpopulationgrowth______(每隔一段时期调查一次).(should)besurveyed
MayraAvilaislookingforwardtoherhighschoolprom(毕业舞会).Avila,18,the
交通行业标准《公路桥梁板式橡胶支座》规定:盆式橡胶支座设计竖向转动焦度应不小于(
一宗地分割为数宗地后,各分割宗地面积之和与原宗地面积差值在规定限差内时,差值按(
房地产经纪业是()的行业。A.知识密集和资金密集 B.资金密集和劳动密集
如果某种商品供给曲线的斜率为正,在其他条件不变的情况下,该商品价格上升将导致(
天然麝香的香气成分是A.麝香酮 B.麝香吡啶 C.降麝香酮 D.羟基麝香吡
女性,40岁,发现高血压3年,血压经常维持在180/100mmHg,伴口干、多尿
下列关于企业法人与项目经理部的描述,错误的有()。A.在建设工程中,施工单位、
最新回复
(
0
)