首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
自考
On a January day in 1975, Ken and Catalina Brugger wandered through an ancient forest in Mexico on a high mountain slope eighty
On a January day in 1975, Ken and Catalina Brugger wandered through an ancient forest in Mexico on a high mountain slope eighty
admin
2022-08-19
24
问题
On a January day in 1975, Ken and Catalina Brugger wandered through an ancient forest in Mexico on a high mountain slope eighty miles west of Mexico City. The air was damp and cool. The sky was cloudy, so little light reached through the trees. As the Bruggers walked along, they realized they were hearing a quiet, constant noise. It was like rain falling on the fir trees. But there was no rain. They looked around for the source of the sound. Suddenly, sunlight broke through the clouds and lit up the forest. The Bruggers gasped in delight. All around them, the trees shimmered with the beating of brilliant orange and black wings. The Bruggers were surrounded by millions of monarch butterflies, resting in their winter home.
The Bruggers’ discovery was important in the world of butterfly study. Butterfly lovers knew that, late every summer, monarchs migrate from Canada into Mexico. More than 300 million of the fragile creatures make the 2, 500-mile flight. But no one knew what became of the butterflies once they reached Mexico. Within the next few years, twelve more monarch roosts were discovered. They were all along the same mountain range where the Bruggers had made their find. Now the mystery was solved.
The monarch’s stay in Mexico is just one part of an amazing life cycle. Every spring, in Mexico, female monarchs lay enormous numbers of eggs. One female may lay more than four hundred a month. She attaches her eggs to milkweed plants. The milkweed provides a perfect first home for the young monarchs. Because milkweed is poisonous to most creatures, birds and other butterfly enemies avoid it. But monarchs love milkweed. The eggs hatch in three to twelve days, and out come worm-like larva (幼虫) which feed on the milkplant. The poison does not hurt them. But it does have an important effect. It makes the monarch as poisonous as the plant was. A bird that eats a monarch will become very sick—and never eat another one.
After living for two weeks as larvae, the monarchs attach themselves to leaves. Then they spin cocoons (茧). After a week, the cocoons open and the butterflies emerge, soon to begin their 2, 500-mile flight northwards. Many of them die as they pass through such southern states as Texas and Louisiana. But first they lay more eggs. After a few weeks, a new generation of monarchs is ready to continue the journey. They—or their children or grandchildren—will reach Canada, where they spend the summer.
The Bruggers did not know where the quiet, constant noise came from because it was________.
选项
A、raining
B、cloudy
C、too bright
D、windy
答案
B
解析
细节理解题。由文章第一段第三句话 “The sky was cloudy…”可知,是因为“阴天”,光线暗的缘故。故选B。
转载请注明原文地址:https://kaotiyun.com/show/Zwrx777K
本试题收录于:
英语阅读(一)题库文史类分类
0
英语阅读(一)
文史类
相关试题推荐
IamspeakingnotasaBriton,notasaEuropean,notasamemberofawesterndemocracy,【C1】______.Theworldisfullofconf
(profit)DrugmanufacturingisthemostbusinessinAmerica.
Failureisprobablythemostfatiguingexperienceapersoneverhas.Thereisnothingmoreexhaustingthannotsucceeding—being
Failureisprobablythemostfatiguingexperienceapersoneverhas.Thereisnothingmoreexhaustingthannotsucceeding—being
【T1】Enthusiasmaboutajoborprojectusuallytranslatesintopositiveenergy.Thatis,ifyouareexcitedaboutaproject,you
(relax)ThePCandTVwillremaintwodifferentexperiences;oneyouinteractwithandsitcloseto;theotheryouturntofor__
AlcatrazIsland,sometimesreferredtoastheRock,isasmallislandlocatedinthemiddleofSanFranciscoBayinCalifornia.
Aheadtrackcoach,BillBowerman,designedapairoflightershoeswithbettersupportandgreaterstrengthandsentthedesign
Sleepisafunnything.We’retaughtthatweshouldgetsevenoreighthoursanight,butalotofusgetbyjustfineonless,
Asacriticofmusicanddrama,______thoughtthatartshouldservesocialpurposesbyreflectinghumanlife,revealingsocialc
随机试题
用滚刀精铣蜗轮是一种啮合对滚过程,因此应使工件绕其轴线自由转动。()
甲向乙发生要约:购买黄豆5000吨,价格为1200元/吨,15日内承诺有效。在乙承诺前,甲又于发出要约后第10日发来传真,提出取消该要约。下列表述中正确的是()
A.右下腹痛伴腹腔内出血B.转移性右下腹痛伴板状腹C.触痛性腹部包块D.右下腹痛向会阴部放射E.右下腹压痛,其部位可随体位改变胃、十二指肠溃疡穿孔可表现为
孕妇28岁,孕1产0,孕29周,骨盆测量:髂嵴间径26cm,髂前上棘间径25cm,骶耻外径18.5cm,坐骨结节间径9cm,骶岬不突,骶骨弧度中等,坐骨棘内突,坐骨切迹宽,耻骨弓角度100°。该孕妇骨盆属于下列哪种类型
A.糖皮质激素B.阿托品C.柳氮磺吡啶栓D.布桂嗪(强痛定)E.洛哌丁胺(易蒙停)克罗恩病患者排便次数过多时应选用
以下有关皮瓣的叙述中,哪项是错误的
A、膈下游离气体B、鹰嘴样阴影C、杯口状阴影D、肿瘤状阴影E、大小肠均胀气乙状结肠扭转的X线表现
库伯等人的“心理旋转”实验说明表象具有()。
聚类的典型应用不包括_______(1),______(2)是一个典型的聚类算法。(2)
BodyLanguageinBusinessI.ImportanceofBodyLanguage—Giveothersa(n)【T1】_____【T1】______—Showour【T2】_____【T2】______—F
最新回复
(
0
)