【简答题】阅读理解。 All over the planet, they are disappearing. Scientists are worried. It may mean the end of the world. I'm not talking about disappearing frogs. I'm talking about absent vowels (元音). I got a mess...
【单选题】The use of nuclear power has already spread all over the world. (1)_____, scientists still have not agreed with what should be done with the large (2)_____ of waste materials that (3)_____ to increase...