首页
登录
职称英语
[originaltext] Monarch butterflies are a common summer sight in the northern
[originaltext] Monarch butterflies are a common summer sight in the northern
游客
2024-04-26
68
管理
问题
Monarch butterflies are a common summer sight in the northern United States and Canada. These large orange and black insects brighten parks and gardens as they fly lightly among the flowers. What makes monarchs particularly interesting is that they migrate — all the way to California or Mexico and back. They are thought to be the only insect that does this.
Every year in the late summer monarchs begin their journey to the south. Those heading for Mexico go first for the Louisiana Mississippi area. They fly across the Gulf of Mexico into Texas. Once in Mexico, they settle themselves in one of about fifteen places in a mountain forest filled with fir trees. Each place provides a winter home for millions of monarchs. There are so many butterflies that they cover entire trees. When spring comes, they begin their long journey north.
The question is often asked whether every butterfly makes the round-trip journey every year. And the answer is no. The average monarch lives about nine months. So one flying north might lay eggs in Louisiana and then die. The eggs of that generation may be found in Kentucky: the eggs of the next generation may end up in Wisconsin or Michigan. The last generation of the season, about the fourth, will make their way back to Mexico and then restart the journey.
Scientists learn about monarchs’ migration by catching and making marks on the insects. By researching a monarch with such a mark and noticing where it came from, the next scientist can get to know things like the butterfly’s age and its routing.
Questions 23 to 25 are based on the passage you have just heard.
23. Which is one of the places where monarchs spend the winter?
24. How can the routing of monarchs’ migration be learned?
25. What does the passage mainly discuss?
选项
A、By comparing their different ages.
B、By counting the dead ones in the forests.
C、By examining the marks made on them.
D、By collecting their eggs in the mountains.
答案
C
解析
选项均以“By+现在分词”开头表明,本题可能考查做某事的方式。根据文中提到的Scientists learn about monarchs’migration by…making marks on the insects可知,科学家通过在这些昆虫身上做标记来了解它们的迁徙路线,故答案为C)。monarchs’migration是听音关键。C)中的marks made on them对应making marks on the insects。
转载请注明原文地址:https://tihaiku.com/zcyy/3572461.html
相关试题推荐
[originaltext]Monarchbutterfliesareacommonsummersightinthenorthern
[originaltext]I’llstillbeworking,butthingswouldbedifferent.Withan
[originaltext]I’llstillbeworking,butthingswouldbedifferent.Withan
[originaltext]M:Whereareyougoing,Catherine?TodayisSaturday.W:Saturday
[originaltext]M:Whereareyougoing,Catherine?TodayisSaturday.W:Saturday
[originaltext]M:Whereareyougoing,Catherine?TodayisSaturday.W:Saturday
[originaltext]W:Whataday!I’mexhausted.M:Well,it’snotoveryet.W:Yeah
[originaltext]W:Whataday!I’mexhausted.M:Well,it’snotoveryet.W:Yeah
[originaltext]W:Whataday!I’mexhausted.M:Well,it’snotoveryet.W:Yeah
[originaltext]M:Iguesswe’llhaveahotsummeragain.W:Iknow.Lastsummer
随机试题
Completethenotesbelow.WriteNOMORETHANTHREEWORDSAND/ORANUMBERforeac
Key______hasbeenbroadcastliveontelevisionandradiotohelpthecitykeepa
Thecharactersfor"Africa"intheMandarinlanguagemean"wrongcontinent".
这个小岛位于城市的东南方向,面积20平方公里,人口3.8万,以其美丽的景色出名。Locatedinthesoutheastofthecity,the
Menaremuch"smarter"thanwomenwhenitcomestoshopping,accordingtoa
求下面分块矩阵的逆矩阵:
现代计算机网络维护管理系统主要由4个要素组成,其中()是最为重要的部分。A.被
2020年全国集成电路进口金额环比增长率最高的季度是:A.第四季度 B
.男性,48岁,吸烟20余年,每天约20支,间断咳嗽、咳痰10年,加重伴喘息2年
神经症的正确评分是()。 (A)病程只要超过半年者可评为3分 (B)精神痛
最新回复
(
0
)