B.Howtheenvironmentaffectsthelivingthingsontheearth.C.Whatkindofchemicalsarelessharmfultotheenvironment.D.Howwehumansmakethebestofchemicalstosavetheearth. 相关知识点: 试题来源: 解析 【答案】(1)猜测词义题。根据文章第一段Toalargeextent(程度),thephysicalformandthehabitsoftheearth'svegetationanditsanimal...
B. The history of humans on the Earth C. The plot twists in Hollywood blockbusters. D. The evolution of the Earth over a long time span.25. Which of the following statements about Knoll is TRUE? A. He reads the meaning behind a fossil better than any other scientists. B. He began ...
The ensuing mass extinction erased about three-quarters of Earth's species, including the dinosaurs at the end of the Cretaceous Period, paving the way for mammals - eventually including humans - to become dominant. The researchers d...
For the history of life on Earth,organisms have relied on the light of the sun,moon,and stars to find their way and schedule their lives. While the beginning of electric lighting in the late 19th century may have benefited humans, it has caused problems in the natural world. Among the im...
Humans are the only species capable of controlling the biosphere (生物圈) on a large scale.5 In contrast, we are the only species that has conscious choice regarding our future and that of Earth's biodiversity. A. The situation is not the same everywhere, however. B. But this time it ...
Humans first evolved in East Africa about 2.5 million years ago from an earlier genus of apes called Australopithecus, which means ‘Southern Ape’. The earth of a hundred millennia ago was walked by at least six different species of man. 1.2 The Cost of Thinking Despite their many differe...
If geologists , with their extremely long-term perspective, are already proclaiming a new phase of the Earth's history, then we should be alarmed. A meaningful scientific approach that also leads to realistic solutions combines natural sciences and a whole range of human sciences. Of central ...
The land of the conterminous United States (CONUS) has been transformed dramatically by humans over the last four centuries through land clearing, agricultural land expansion and intensification, and urban sprawl. Spatial-temporal data on long-term historical changes in land use and...
Over 200 million years ago, on Earth there 3 a group of animals: the dinosaurs. They have dominated (支配) the Earth 4 up to 1.5 million years. However, dinosaurs died out 5 . Nobody knows why. And a very long time later, humans 6 and no one has seen a 7 dinosaur up to now...
Few large animals live in national parks.Another problem that large animals face from humans is those people who kill elephants for their teeth, tigers for their skin and so on. They sell some parts of animals for plenty of money.Toward the end of the nineteenth century, environmental ...