12、It is___that tells the birds when to begin their migration. (2.5分)○ time○ machine○ instinct○ energy 相关知识点: 试题来源: 解析 C 本题考查名词辨析,需要选择最符合句子意思的词。句子意为“是什么告诉鸟类何时开始迁徙”。四个选项中,只有“instinct” (本能) 最符合鸟类迁徙的特征,因为鸟类...
One day the rose saw birds put their beaks (喙) into the cactus and then fly away. The red rose asked the pine tree what the birds were doing. The pine tree explained that the birds were getting water from the cactus.“The cactus has water” asked the rose.“Yes, you can also ...
Orientation is simply facing in the right direction; navigation involves finding ones way from point A to point B.Early in his research, Kramer found that caged migratory birds became very restless at about the time they would normally have begun migration in the wild. Furthermore, he noticed ...
When she was a child, what she liked to do most was to watch the blue sky and enjoy birds flying freely in the sky. She always ___ that some day she could also fly like a bird.When Jenny was in the fourth grade, her teacher asked them to write a passage about their ___. In ...
It is a word usually used to talk about certain animals such as birds,fish and so on.When animals migrate,they travel a long way from one part of the world to another according to the season.For example,swallows (燕子) migrate south in winter.Many animals migrate--th...
FEMALE PROFESSOR:But finding your way back to your nest when you’ve been accidentally displaced is a little different from getting home after your annual migration to a warmer climate. So, do you think all those mechanisms we discussed… that birds use when migrating… apply to homing as wel...
When I was a child growing up in Ohio, the butterflies would sometimes pass through on their way to Mexico. And it was wonderful to see football fields full of them—and I wanted to revisit that on a larger scale (规模). I knew I had to go to see the migration (迁徙) in Mexico....
一篇完形英语You and your friends cannot run a long way when you’re hungry,can you?Birds __1__,either.So __2__migration(迁徙),they eat a lot to build fat(脂肪) for energy.Fat can be up to 50 per cent of a migration bird’s ___3__.Migratio
Like many other animals swallows( 燕子 ) will fly south when the days turn c___1___ and the l___2___ from trees begin to fall. They travel many miles to find a warmer winter. This k___3___ of travel is called migration ( 迁徙 ). Birds are animals that like to migrate ...
This type of travel is called migration (迁徙). Birds are animals that like to migrate a lot when it is cold. About 600 out of 9,000 kinds of birds do it. They leave in autumn and come back during the warm spring months. Many birds don’t like the cold. They need food, but ...