Some reptiles(爬行动物)slither , like snakes. Water animals, such as fish and frogs, can swim. Are there any creatures that can fly? Yes! Birds, bugs(小昆虫) and bats are such creatures. All birds have wings. They have feathers, too. They are the only creatures with feathers. Their ...
Some reptiles(爬行动物) slither, like snakes. Water animals, such as fish and frogs, can swim. Are there any creatures that can fly? Yes! Birds, bugs(小昆虫)and bats are such creatures.All birds have wings. They have feathers,too. They are the only creatures with feathers.Their feathers...
[C] Some reptiles, known as pterosaurs, were able to fly. But - even though they looked like them - these were not dinosaurs. Pterosaurs such as Tupanura could probably fly up to 16,000 kilometers nonstop. Scientists believe pterosaurs were actually very heavy. So they probably could ...
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Long before man lived on the Earth,there were fishes,reptiles,birds,insects,and some mammals.Although some of these animals were ancestors of kinds living today,others are now extinct,that is,they have no descendants alive now. Nevertheless,we know a great deal about many of them because their...
1. Intestinal maltase,isomaltase, sucrase, lactase and trehalase activities were assayed in mucosal scrapings from a quail, a crane, a turtle a peccary and an elephant. 2. 2. The birds, the turtle and the elephant have been found to be lactase deficient, the birds were also trehalase def...
just as though the dreamer were really looking at moving objects.These signs of dreaming have been detected in all mammals (哺 乳动物) studied,including dogs,monkeys,cats,and elephants,and also some birds and reptiles (爬行动物).This period of sleep is called the“D”state for around 50% ...
There are two extra choices, which do not fit in any of the blanks. Long before Man lived on the Earth, there were fishes, reptiles, birds, insects, and some mammals. Although some of these animals were ancestors of kinds living today, others are now extinct, that is, they have no ...
In some countries, people keep “hamsters” as pets. “Hamsters” are small ___. A. animals B. insects C. birds D. reptiles 相关知识点: 试题来源: 解析 A。“hamsters”(仓鼠)是小型动物,B 选项“insects”(昆虫)、C 选项“birds”(鸟)、D 选项“reptiles”(爬行动物)都不符合仓鼠的类别。在...
11.Thirtypercent of reptiles, birds, and fish are (current)threatened with extinction. 12.Hestuffed the newspapers into a litter bin headeddown the street. 13.Ifhis experience then had been carefully recorded, it would undoubtedlyhave been thrillingstory. ...