题目

语法填空:用所给单词的适当形式填空，未提供单词的根据上下文填入适当的词。Exercising helps people to keep healthy. But common sports such as playing basketball and swimming【1】 (like) by fewer and fewer people. There are lots of other ways【2】 (exercise). One good way is hiking.What is hiking? 【3】 (Hike) doesn’t really mean taking a long walk. Often, hiking 【4】 (include) going up or down a hill. Most people do it in 【5】 countryside, but you can also do it in town. During hiking, you can enjoy the beautiful view, watch the 【6】 (interest) p已知i，j为互相垂直的单位向量，向量a=i+2j，b=i+j，且a与a+λb的夹角为锐角，则实数λ的取值范围是（　　）A．(-53，0)∪(0，+∞)B．(-53，+∞)C．[-53，0)∪(0，+∞)D．(-53，0)