首页
登录
职称英语
[originaltext] Many egglaying animals merely lay their eggs and leave. With
[originaltext] Many egglaying animals merely lay their eggs and leave. With
游客
2023-07-12
60
管理
问题
Many egglaying animals merely lay their eggs and leave. With turtles for instance, the eggs hatch on their own. The current theory about birds is that the earliest birds did just that, when they were coldblooded creatures living in warm places. However when they became warmblooded creatures living in cold places they had to remain on top of the eggs to keep them warm. This process we call incubation. For this they needed a place, a nest very likely the first nests were just primitive depressions scraped into the ground. Even now many species still lay eggs in this sort of crude nest. In fact, every spring a mother killdeer lays her eggs in scene pebbles along the edged the parking lot just outside this building. Primitive nests on the ground were fine for some birds but others began to elevate their nests onto Branches, perhaps to avoid predators. These early elevated nests were probably loose platforms of sticks and twigs, the types still built by ospreys and mostarians today. The latest evolutionary development in nests the most re cent version, so to speak, is the cupshaped nest. This is the one we regard today as the typical bird’s nest, you know, like a robin’s nest.
选项
A、On the highest branches of trees.
B、Inside tree trunks.
C、On the ground.
D、In cold places.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2830016.html
相关试题推荐
【B1】[br]【B11】[originaltext]Amongthemostpopularbooksbeingwrittentoda
【B1】[br]【B7】[originaltext]Amongthemostpopularbooksbeingwrittentoday
【B1】[br]【B6】[originaltext]Amongthemostpopularbooksbeingwrittentoday
【B1】[br]【B4】[originaltext]Amongthemostpopularbooksbeingwrittentoday
【B1】[br]【B3】[originaltext]Amongthemostpopularbooksbeingwrittentoday
【B1】[br]【B2】[originaltext]Amongthemostpopularbooksbeingwrittentoday
[originaltext]Chequeshavelargelyreplacedmoneyasameansofexchange,f
[originaltext]Chequeshavelargelyreplacedmoneyasameansofexchange,f
[originaltext]Chequeshavelargelyreplacedmoneyasameansofexchange,f
[originaltext]TheclimateofthewestcoastisthemostmoderateinCanada.
随机试题
•Lookatthechartbelow.Itshowsarestaurant’sincome,totalexpenditureand
IwasborninChina.What’syour(nation)______?nationality本题测试的是词性转换。全句的意思是:“我
Beingassertiveisbeingabletocommunicatewithotherpeopleclearly.Ify
Photographersarealwayslookingfornewinspiration,atleastthegoodones
[originaltext]Anaveragepersonconsumes144pintsofmilkayear,but40%oft
假设某生产管理网络系统采用B/S工作方式,网络中的用户数为120个,每个用户平均
8月份,患儿5岁前来就诊,发热、头痛、恶心6天,伴抽搐、意识障碍2天,入院后查体
影响尿液颜色最大的因素是A.尿糖B.尿pHC.尿卟啉D.尿色素E.尿量
《中华人民共和国教育法》中规定学生应尽的义务有()。A.遵守学生行为规范 B
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
最新回复
(
0
)