no one will know just how many cryptic species exist.其意思就是人们目前还不知道存在多少隐蔽性物种。第五段的最后一句也说明了研究者目前对此尚未了解。结果一 题目 {{B}}第二篇{{/B}}Do scientists know how many cryptic species exist A.Not yet.B.Yes, they do.C.They will know the answer in...
A. create new species B. understand how organisms adapt to their environment C. destroy harmful organisms D. make all organisms look the same 相关知识点: 试题来源: 解析 B。科学家研究遗传变异是为了了解生物如何适应环境。遗传变异使得生物能够在不同的环境中生存和繁衍,通过研究遗传变异,科学家可以了解...
Many scientists believe that intelligent life forms may exist on other planets and messages should be sent into space to contact these life forms. Other scientists think this is a bad idea because these life forms could be dangerous. Discuss both these views and give your own opinion. Give rea...
根据文章第二段Although scientists had known that some birds could understand the alarm calls of other species and use their ability to escape danger, it was unknown how they developed this ability.可知,鸟类发出报警信号意味着它们需要逃离。故选A。 【2】推理判断题。根据文章第四段scientists played ...
50. What do we learn from the last paragraph about the process of aging? A) It may vary from individual to individual. B) It challenges scientists to explore further. C) It depends on one’s genetic code. D) It may be controlled to a degree. Passage Two Questions 51 to 55...
题目 Reptiles,like snakes,lizards,and crocodiles are egg-laying animals.The species are cold-blooded,which means their bodies have the same temperature as the area around them.A recent report says that more than one-fifth of the world5 s reptiles are at risk of going ext...
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1. Why do scientists use DNA information from elephants? A.To improve the health of elephant tusks. B.To keep track of the illegal dealers. C.To protect elephants against natural disasters. D.To research into elephants’ habits.2. What may make illegally hunted elephant tusks hard to find?
Lizards that can outrun blazes. Birds that lay ash-colored eggs. Wildlife may have a limited ability to evolve in this fiery new era known as the Pyrocene.
giving a clear interpretation of the illustrations and enough background to enable one to understand something of the many zoologists who created numerous ways to understand the natural world of animals. This is a worthwhile account covering the work of many of the scientists, from a Western pers...