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
68
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/3228183.html
相关试题推荐
OneofthewildestandmostinaccessiblepartsoftheUnitedStatesaretheEver
EvenbeforethehumanorganismdevelopedintotheirpresentstageofHomosapien
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
随机试题
Normallyastudentmustattendacertainnumberofcoursesinordertogradu
Britonsareincreasinglyentertainingguestsathomewithdinner,filmandk
用4种方法治疗成人贫血,治疗一段时间后,记录每名患者的血红蛋白治疗前后的改变量当
关于结核病发病机制错误的是A.机体受结核菌感染后产生免疫力,同时也产生变态反应
遗传性球形细胞增多症的临床表现不包括A.感染 B.出血 C.急性左心衰 D
根据我国《宪法》规定,下列有关劳动与休息的选项正确的是()。A.劳动既是公民的
下面行业属于生命周期成长期的是( )。 I遗传工程 Ⅱ生物医药 Ⅲ规模计
可使新生儿、婴幼儿产生高铁血红蛋白血症的药物不包括A.地西泮 B.氯丙嗪 C
下列各项中不属于工业企业能源消费的有()。A.回收利用的余热、余能 B.用
在所示双代号时标网络计划中,如果A、H、K三项工作共用一台施工机械而必须顺序施
最新回复
(
0
)