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
医学
A、They prefer warmer weather. B、There are not enough moths to eat. C、They are looking for brighter flowers. D、They don’t want to
A、They prefer warmer weather. B、There are not enough moths to eat. C、They are looking for brighter flowers. D、They don’t want to
admin
2015-01-26
93
问题
Today I’d like to discuss the first non-instance of strange evolutionary strategy. This phenomenon occurs in a flowering plant called the scarlet jilia. The scarlet jilia depends on hummingbirds and moths for pollination. And the blossoms seem to change their color for each of these pollinators. On fern mountains near Flagstaff, Arizona where these flowers grow, hummingbirds arrive in mid-July to drink nectar from the scarlet jilia. In July, the flowers are bright red, which is attractive to the hummingbirds. By late August, however, the hummingbirds leave the area for a warmer climate. As the weather cools, the color of the plant blossoms changes to white, a color that attracts a particular moth species, the night-flying hawk moths. Apparently, this kind of moths can see these white blossoms easily at night. These moths continue to pollinate the flowers until well into September. The scarlet jilia demonstrates at an unusual way in which the plant lures pollinators to continue its life cycle.
Questions 16-20 are based on the passage you have just heard.
16. What’s the main topic of the talk?
17. Why is the scarlet jilia plant considered to be unusual?
18. Why do the hummingbirds leave fern mountains?
19. When is the scarlet jilia plant pollinated?
20. According to the speaker, in what way are white blossoms attractive to moths?
选项
A、They prefer warmer weather.
B、There are not enough moths to eat.
C、They are looking for brighter flowers.
D、They don’t want to be caught by other pollinators.
答案
A
解析
从“By late August,however,the hummingbirds leave the area for a warmer climate.”可推知蜂鸟离开这个地方去找暖和的去处。
转载请注明原文地址:https://kaotiyun.com/show/vLT3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
Cultureshockmightbecalledanoccupationaldiseaseofpeoplewhohavebeensuddenlytransplantedabroad.Likemostailments,
Cultureshockmightbecalledanoccupationaldiseaseofpeoplewhohavebeensuddenlytransplantedabroad.Likemostailments,
A、Courageous.B、Lazy.C、Curious.D、Cowardly.C女士讲到如果晚上听到奇怪的声音,她会lieawakealittle等着听这种声音是否再次出现,如果声音再次出现她就起床看看,这就表明她好奇心很浓。
Readingabookandlisteningtomusicsimultaneouslyseemstobenoproblemforthem.
Everyday,overamillionpeoplelogontodifferentInternet-basedgames.Thereistrulysomethingforeveryoneinthegamingwo
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassicalandmedievalworlds,whiledur
A、HelpLaurawithherpapernextweek.B、AskLauratocleantheapartmentbyherself.C、Asksomeoneelsetocleantheapartment
A、Hemovedintohisnewapartmentacoupleofmonthsago.B、He’dlikethewomantohelphimpaytherent.C、HeandPeterhavedo
Ithadover2,000apartmentcomplexes,agreatmarket,alargenumberofindustrialworkshops,anadministrativecenter,anumbe
随机试题
多不饱和脂肪酸是指含有两个以上不饱和键的脂肪酸。()
胃脘胁肋胀满疼痛,呃逆嗳气,吞酸嘈杂,苔薄黄属于
A、嵌顿性股疝B、肠蛔虫团堵塞C、急性乙状结肠扭转D、急性肠套叠E、肠系膜上动脉栓塞常以单纯机械性不完全性肠梗阻为表现的是
妊高征使用硫酸镁解痉时,应停用药物的情况是
人身权
水工建筑物一般按它的()等来进行分类。
下列各种工作的错误,应当用红字更正法予以更正的是()。
“乒乓外交”推动了20世纪70年代中美两国关系的恢复,打开了中美关系的大门。这场“小球转动大球”的外交,体现了体育的()。
你可能会遇上一位深藏不露的智者,其不经意间的一句话让你_____________;也可能会碰上一位令你心动的小伙或姑娘,铁轨的轰鸣声也无法干预你_____________注视的目光;或者走遍_____________,你才恰好在火车上得了一剂妙手回春的药方
【B1】【B6】
最新回复
(
0
)