阅读理解

    Hello, I'm Bob. Look! This is a book. It's my English book. That is a black eraser. It's Mike's eraser. My eraser is black. It's in my pencil box. Oh! What's that? It's a dictionary. It's Tom's dictionary. Are the rulers Tom's? No, they aren't. They're Jenny's.

观察后面的一组单项式：a，-2a²，4a³，-8a⁴，…，根据你发现的规律，则第6个式子是（       ）

— Jack, I call to tell you I have no time to attend your party next Friday.  —What a pity!

函数y=kx²﹣6x+3的图象与x轴有交点，则k的取值范围是（　　）

曾经作为“伐木模范”的马永顺，为新中国的建设采伐原木大约36500棵，创全国手工伐木产量之最，在新时代他又成了“植树英雄”，义务植树5万多棵，为世人留下一片绿萌、一种精神。马永顺的事迹表明（    ）

①植树是拥有幸福人生的根本途径

②真理是具体的有条件的相对的

③值观对人们认识世界具有指导作用

④价值判断与价值选择具有社会历史性