首页
登录
职称英语
Every April, along with many other species of birds, the swallow arrives to
Every April, along with many other species of birds, the swallow arrives to
游客
2024-08-13
10
管理
问题
Every April, along with many other species of birds, the swallow arrives to spend the summer months in northern Europe, Iran and parts of Russia’s Siberia. Here it will breed and raise its young.
The swallow is well known for several reasons. Firstly, it is very distinctive, with its forked tail and characteristic acrobatic swooping flight. Secondly, it is very common, and, like its near relative the house martin, lives in close proximity to human habitation, at least in rural areas. 【B1】_________
For centuries, people have observed swallows, and noted their arrival and their patterns of feeding. 【B2】_________ In England, people comment on unpredictable late spring weather by saying, "One swallow does not make a summer." Similarly, "The swallows are flying low" was held to predict rainy, even stormy weather.
【B3】__________Insects keep low in these conditions, so do swallows that hunt them. At the end of the summer season, when swallows are about to leave, they frequently flock together in large numbers. When people remark that swallows are gathering, they mean the autumn has arrived.
At some point in mid-September swallows leave together, usually all on the same day. One day there are thousands, the next there are none, and none will be seen again until the following spring. For centuries, this was a complete mystery to people. The Hampshire naturalist Gilbert White, writing in the late eighteenth century, believed that swallows dived into ponds and rivers in autumn and remained in the bottom mud the whole winter, re-emerging the following spring. This idea seems extraordinary to us, but White was not a stupid man: many of his other observations of natural life were informed and accurate. 【B4】_________The idea that swallows migrate to central or southern Africa would have seemed as fanciful to him as his theory seems to us.
Although we now know that swallows migrate, there are still unanswered questions. Why do they go so far? Why not stay on the shores of the Mediterranean? The majority continue to equatorial Africa, and some even further south. 【B5】_________ Those from France, Germany and much of western Europe have mostly been traced to East Africa, Kenya or Tanzania, for example. Above all, how does a bird weighing approximately twenty grams find its way across mountain ranges, ocean and desert to winter in the south, and then return the following year to the very location it was born, in some cases to the very same nest?
Complete the passage with the following sentences. There are two extra sentences that you do not need to use.
A. In several countries, these observations have passed into the language as proverbs or sayings.
B. In this case, however, he simply had no means of determining the truth and was forced to make a random guess.
C. There may be some truth in this observation, though it is the insects the swallows feed on that seem to be more susceptible to the fall in barometric pressure that heralds a storm.
D. Also it appears that populations of swallows that have bred in different countries also spend the winter in different areas.
E. By these means, they travel quite long distances.
F. It is, however, rarely to be encountered in towns or cities.
G. Exhausted swallows sometimes come to rest on ships way out in the Atlantic Ocean. [br] 【B4】
选项
答案
B
解析
空格前提到这个想法对我们来说似乎非同寻常,但怀特并不是一个愚蠢的人:他对自然生活中的许多其他观察都是有根据的也是准确的。空格后提到燕子迁徙到非洲中部或南部的想法,在他看来是异想天开的,就像他的理论在我们看来也是异想天开的一样。结合选项可知,选项B(然而,在这种情况下,他根本没有办法确定真相,只能随意猜测)与上下文衔接紧密,故答案为B。
转载请注明原文地址:https://tihaiku.com/zcyy/3718091.html
相关试题推荐
Whatisatthetopofthelistofspeciesextinctions?[originaltext]Researchers
Inmanypartsoftheworld,alienspeciesareharmingtheenvironmentandca
Inmanypartsoftheworld,alienspeciesareharmingtheenvironmentandca
Inmanypartsoftheworld,alienspeciesareharmingtheenvironmentandca
Seedcataloguesfeaturehundredsofdifferentfloweringspecies.Fortheper
Seedcataloguesfeaturehundredsofdifferentfloweringspecies.Fortheper
Seedcataloguesfeaturehundredsofdifferentfloweringspecies.Fortheper
EveryApril,alongwithmanyotherspeciesofbirds,theswallowarrivesto
Inwhatwaydoespheromoneworkonthesamespeciesofplantoranimal?[br][o
Inwhatwaydoespheromoneworkonthesamespeciesofplantoranimal?[br][o
随机试题
Ourshasbecomeasocietyofemployees.Ahundredyearsorsoagoonlyoneo
众所周知,吸烟不仅有害我们的健康,对环境也不利。吸烟能引起许多疾病,如肺癌(lungcancer)。吸烟也会影响不吸烟的人。被动吸烟者(passive
()是指具有特别高或较高的历史文物与文献资料价值的书本。A.聚珍本 B.卷子
项目经理必须组织对施工现场作业人员进行(),组织审核建筑施工特种作业人员操作资格
石油沥青混合料中集料可优先采用()。A.石灰岩 B.花岗岩 C.砂岩
有机磷酸酯类急性中毒时,可改善瞳孔缩小、呼吸困难、腺体分泌增多等症状的药物是A.
紧缩性货币政策的主要功能是()。A.抑制社会总供给 B.缩小贸易顺差 C.抑
1997年6月,依托同业拆借市场的()业务获准开展,同业拆借市场与票据市场一起
关于定标的说法,正确的是( )。 A.确定中标人的权利归评标委员会 B.招
髙血压危象降低血压宜首选 A.硝苯地平口服 B.卡托普利口服 C.硝普钠静
最新回复
(
0
)