题目

Our house has reached the point     so many things need         and it’s so hard to find the time to fix them.        A．at which; to do up                        B．that; doing up        C．on which; to put up                      D．where; putting up 答案：D ATP分子简式和18个ATP所具有的高能磷酸键数目分别是： [　　] A．A－P－P－P和18个 B．A－P－P－P和36个 C．A－P－P和36个 D．A－P－P－P和56个