【单选题】How the First Stars in the Universe Came into Existence Researchers believe that our universe began with the Big Bang(宇宙大爆炸)about 13 billion years ago,and that soon after that event,matter began to fo...
【单选题】听力原文: Congratulations, everybody. Welcome to our university. The starting of the university can be ex- citing on the one hand, and can also be worrying on the other. No matter how you are going to lea...