题目

若a＞0，b＞0，且函数f(x)＝4x3－ax2－2bx＋2在x＝1处有极值，则ab的最大值等于( ) A．2                    B．3 C．6                    D．9 答案：D  Hello, I’m Tom. I’m a middle school student. It’s nice to meet you here. First, let me tell you _  16    about my family. There are five people in my   17  . They are my mother, my father, my sister, my brother and I.My father is a worker. My mother is an English teacher. My sister is eighteen and my brother is sixteen. I’m fourteen. We  18   go to the same school. We all enjoy _19  football games.My_  20   is in West Street. There is a big tree and some small trees around my house. The big one is a pear tree and the small ones are apple _ 21  .   22   there  23   any pears or apples on them now.   24 _ a photo of my house. In the photo, you can see three cats in my house. They are all black and white. We_  25   them very much.小题1:A．anything B．something C．thingD．anyone小题2:A school      B. house        C. room     D. family小题3:A．twoB．fiveC．threeD．six小题4:A．seeingB．looking atC．watching D．looking小题5:A．bedB．schoolC．roomD．home小题6:A．treesB．riversC．housesD．schools小题7:A．ButB．AndC．SoD．Or小题8:A．isn’tB．isC．areD．aren’t小题9:A．He’sB．Here’sC．It’sD．There are小题10:A．are liking B．likesC．likeD．is liking