A. Because they look like lungs. B. Because they produce oxygen and absorb carbon dioxide. C. Because they are soft. D. Because they can fly. 相关知识点: 试题来源: 解析 B。解析:植物被称为地球之肺是因为它们产生氧气并吸收二氧化碳。不像肺、柔软、能飞都不是被称为地球之肺的原因。反馈...
Rare Earth Elements (“REE’s”) or Rare Earth Metals are a set of seventeen chemical elements in the periodic table, especially the fifteenLanthanidesplusScandiumandYttrium, which are considered “Rare Earth Elements” since they tend to occur in the same ore deposits as the lanthanides and exh...
we also take for granted a group of elements called rare earth metals, whose special electronic and magnetic properties make them a key component of many 21st century technologies. These 17 elements are actually plentiful enough — you
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Besides, doctors tell us that drinking water each day is healthy.For many kids, juice or milk are their favorites. These drinks are healthy and give kids vitamins and energy (能量) during the day. Adults usually choose between tea or coffee.【小题1】What does the writer want to tell ...
Earth Day is on April 22nd.People say thanks to the Earth and learn ways to keep the Earth safe and clean.But saving the Earth is not just for grow-ups.Kids are also taking an active part in it.The American writer and filmmaker Lynne made a film called Young Voices for the Planet.It...
The best of National Geographic delivered to your inbox Sign up for more inspiring photos, stories, and special offers from National Geographic.Sign Up Legal Terms of Use Privacy Policy Interest-Based Ads Our Sites Nat Geo Home Attend a Live Event Book a Trip Buy Maps Inspire Your Kids Sho...
There are only a few kiwis in New Zealand now. The government says that people can't kill kiwis. New Zealanders want their kiwis to live. There is a picture of a kiwi on New Zealand coins. People from New Zealand are sometimes called kiwis. ...
Exercises do little good if they don’t have time to sink in.Finally,find the best time of day to do your studying.Don’t do it when you have many other things on your mind or when you are exhausted. Your mind has to be receptive for learning to take place....
The truth is, bees are crucial elements of our environment, and almost never get the credit that they deserve. If bees didn’t exist, humans wouldn’t either. Out of the 100 crop species that provide us with 90% of our food, 35% are pollinated by bees, birds and bats (source). It...