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 huma
根据第三段中的“The government has already permitted the company to use special materials to make it easier for the vehicle to fly."可知,政府对此项 目给予支持,持赞同的态度,故 B项正确。 cautious“谨慎 的” ;favorable“赞同的” ;ambiguous“模棱两可的” ;disap- proving“不赞同的” 。 e 4...
The tuna can swim faster than the steady whale. There are outliers that are even more distant from the general trend, but they should not be confused with the fastest runners, swimmers and fliers. For example, there are insects (e.g., the flea) that snap and jump at speeds much ...
Veterans groups also sided with the airlines, arguing that a boom in untrained dogs and other animals threatens their ability to fly with properly trained service dogs. Last year, more than 80 veterans and disability groups endorsed banning untrained emotional-support animals in airline cabins. On...
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 ...
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
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...
There are some interesting contrasts in the Gemini-Sagittarius continuum that help illuminate the unique energy of each sign. On all planes of being, both these extremely mental signs are connected with the furtherance of knowledge. Both signs have an emphatic need to communicate, usually in a fr...
7.What can’t fly, geese ,kites,planes,turkeys,rabbits,goats ,ducks and lambs? 8.Can you fly? 9.Which is bigger,a turkey or a duck? 10.What word is for baby chicken? 6.Are bears fierce animals? 7.Sea cucumbers are vegetables,aren’t the 正在翻译,请等待...[translate]...
In the 21st century we can see what they are doing with their wings, but until the 20th century that was unimaginable. We know that birds can fly, but we are not engineers, and do not try to modify them to fly better. We biologists are, in effect, reverse engineers. We know nothing...