已知一个角的补角等于这个角的余角的3倍，则这个角等于_ ___度.
It was reported that the plane I was to have taken crashed soon after it took off. _______ the traffic jam, I was five minutes late for the plane. A. As a result of B. Thanks to
若把单词“error”中字母的拼写顺序写错了,则可能出现的错误的种数是( ) A.20 B.19 C.10 D.9
Choose the correct sentence:____. A.That’s all what I need. B.That’s something I need C.That’s what that I need. D.That’s all wh
设集合A={x|＜0},B={x|x-1|＜a},则“a=1”是“A∩B≠”的（ ） A.充分不必要条件 B.必要不充分条件C.充要条件
任务型阅读 More and more people are worried about A（HlN1）flu（流感）. Some school even stop classes because some students have got it．What is A（H1N1）flu? A（H1NI）
顾炎武在《天下郡国利病书》中指出：“海滨民众，生理无路，兼以饥馑荐臻(荐臻：接连到来)，穷民往往入海从盗，啸集亡命”。导致这一现象的直接
A、B、C为三种短周期元素，A、B同周期，A、C的最低价离子分别为、，与具有相同的电子层结构，下列叙述一定不正确的是 A．离子半径>>
＝2，
＝a，则a＋b为