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
2024-11-12
16
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] 【S7】
选项
答案
that—which
解析
关系代词误用。在引导非限制性定语从句时,用which而不用that。
转载请注明原文地址:https://tihaiku.com/zcyy/3842743.html
相关试题推荐
ElizabethBlackwell,thefirstwomanmedicaldoctorintheUnitedStates,founde
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
NewresearchfromtheUnitedStatessuggeststhatthemillennia-oldtherapy
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
About25millionautoaccidentsoccurintheUnitedStateseachyear.Appro
随机试题
Ifpetownershaveaneyewithfashion,theycandresstheirpetsinstylishclo
CarsaccountforhalftheoilconsumedinTheU.S.,abouthalftheurban
Forthelastfiftyyears,theglobehasbeenwarmingup.Itistruethat
Itisplaincommonsense--themorehappinessyoufeel,thelessunhappiness
[originaltext]W:Oh,I’mfedupwithmyjob.M:Hey,thereisaperfectjobfor
观察交换机状态指示灯可以初步判断交换机故障,交换机运行中指示灯显示红色表示()
监督机构在基础和结构阶段应()安排监督检查。A、每季度 B、每月 C、每周
具有泻下通便、清肝、杀虫作用的是A.芦荟 B.苦楝皮 C.番泻叶 D
关于21-三体综合征下列哪项不正确A.本病不属于常染色体畸变 B.小儿染色体病
(2016年真题)采用滑模摊铺机施工法铺筑连续配筋混凝土路面时,布料最适合采用(
最新回复
(
0
)