they can only fly to the places where they live 3. Bats make a sound so that ___. I. they can know where the things are J. they can find their friends K. they try to tell their friends where they are L. their "food" can fly to them 4. From the passage, we know __...
Keep in mind that pets can suffer from heatstroke when left in a small enclosed space,so at least two open windows are necessary for fresh air.⑱Remember to park in the shade. Stop pets from pushing open the door and jumping against seats and people.⑳ At the hotel,you s...
英语文章首字母填空、Bats are the only flying "animals".It is known to all that cannot see very well."As b___as a bat "is often heard.Yet,they have no trouble fling on the darkest nights and f___ their way round very well.Why can bats fly and see at night
8.The birds' ___ can make them fly high in the sky. 9.The ___ jerboas look like rabbits. 10.It is important to stop the rich lands from turning into ___. Ⅲ.单项选择 ( )11.—What do you think of the movie Fa...
How can bats fly and see at night? They fly by radar(雷达). The bat's radar system(系统)works the same way as the radar in ships and planes. As a bat flies through the air, it makes a sound. If the sounds hit things, they will come back and the bat...
How can bats fly and see at night? They fly by radar(雷达). The bat's radar system(雷达系统) works the same way as the one that ships and planes use. As a bat flies through the air, he makes a sound that is too high for our ears to hear. When the sounds hit things, they ...
airline companies began to fly at higher altitudes to lower their cost—the air density(密度) is lower up there,creating less drag (阻力) for airplanes.However,higher altitudes came with problems,like the fact human beings can’t really survive at 30,000 feet.To make that possible,the cabin...
Birds arecreatureswhich can fly. [ ] A. an animal B. animals C. things D. planes 试题答案 在线课程 答案:B 解析: creature在这里意为“生物”,因其会飞,故是动物 练习册系列答案 学业质量模块测评系列答案 新课标培优专项通专项训练系列答案 ...
Ctheyareanimals,buttheycanflyDtheyareusefulanimals .. 2As___,batscaneasilyfindfoodonthedarkestnights. () A.theycanseeeverythingallthetime B.theycan“hear”everythingaroundthem C.theyhavegoodeyesight D.theycanonlyflytotheplaceswheretheylive 3Batsmakeasoundsothat___. () A.theycanknowwherethething...
Results It has been suggested by von Ka´rma´n & Burgers11, and echoed by Lighthill12, that fish swimming (due to their caudal fins) is a self- regulating process that can occur only at transitional Reynolds num- bers; a reverse Ka´rma´n jet is present, and optimal efficiency...