题目

—Do you know who _____ a theory about black holes?  —Yes, it is Stephen William Hawking. A. put away         B. put forward          C. put down        D. put on 答案：B函数f（x）的定义域为R，f（-1）=2，对任意x∈R，f′（x）＞2，则f（x）＞2x+4的解集为    ．