Though taxonomists have been cataloguing plants and animals for more than 250 years, they still have no exact answer to the question, “How many species are on Earth?”“It’s a very simple question, but we have no simple answer,” Fisher said. One of the reasons we can’t get an...
How did Earth get so many species(物种)? For thousands of years, people wond-ered. In the 1840s, one naturalist (博物学家) had an idea. His name was Charles Darwin. He spent his whole life studying animals and insects. Darwin thought that new species developed slowly, as populations of...
()60. -How many species of animals do you think will be threatened with extinction when the surroundings around are damaged by mankind?-I expect quite a few. A. there being S B. there to be C. there have been D. there be 相关知识点: ...
How many new species of monkeys have been identified in Brazil alone over the last year? A. Eight. B. Nine. C. Ten. D. Eleven.正确答案:B解析:事实细节题。本题询问去年只在巴西一国就新发现多少种猴子。本题答案可以从文章第二段末句得出。选项B为正确答案。 相关知识点: ...
7. How do migratory animals know where they're going? 7.迁徙动物如何知道它们要去哪里? 8. How many species are there on Earth? 8.地球上有多少物种? 9. How do organisms evolve? 9.有机体是如何进化的? 10. Why did dinosaurs grow to be so big?
Many animals are endangered. Some people argue that we should only protect animals that are useful to human beings. To what extent do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 words. Task 2...
根据原文“Around 380 million years ago,only 300 species groups were left in existence”,可以判断C是正确选项。 知识模块:句子听辨 听力原文:During the past 1. 65 million years, there have been four major episodes of global cooling, which resulted in great migrations of animals and plants. Yet,...
[translate] aWhich human factor most seriously threatens the survival of animals? 正在翻译,请等待... [translate] aHabitat destruction. 正在翻译,请等待... [translate] aHow many species of birds, mammals, invertebrates, and plants are endangered? 正在翻译,请等待... [translate] ...
Why the species is able to delay gratification is a bit of a mystery.For humans,scientists believe the quality strengthens social bonds.An example would be when you see someone wait for a partner to eat.Delayed gratification can also be a function of tool-building animals,who need to make ...
短语:be in danger;with the development of;at the same time;stop … from;work together。 句型:(1)Many wild animals are in danger because the environment that they are living in has changed a lot. 许多野生动物处于危险之中,因为它们生活的环境已经发生了很大的变化。该句是由because引导的原因状语...