图书馆现将8本新书平均分成4份，请问一共有多少种分法（）
A．A
B．B
C．C
D．D
参考答案：D
解析：
先从8本书中选出2本，有[*]种分法；再从剩余的6本书中选出2本，有[*]种分法；再从剩余的4本书中选出2本，有[*]种分法；最后剩余的2本书中选出2本，有[*]种分法。这样就把8本书平均分成了4份，然后这4份应该是没有先后顺序的，所以一共有[*]种分法。
阅读下面短文，从每题所给的A、B、C、D四个选项中，选出一个能填入文中相应空白处的最佳答案。  Do you write your own blog(博客)？Do you often 36 others' blogs on the Internet? All over the world, not only famous persons but also many students use blogs as diaries and places to share their experience and 37 advice or help. “I write my activities every day, 38 funny things or worries in my life.” says Lali, a 16-year-old high school student at Cambridge High School in Washington." I like putting pictures on my blog because it can make my blog more 39 and more people will like it, It's a good way to 40 my life to the world." She has had her blog for eight months. Students like writing blogs 41 they can write anything they want to, but don't need to 42 any money. Once(一旦)you start to write your blog, you will 43 that you open up a new world. But what you write down may trouble you 44 .So, use the blog carefully 45 you can keep yourself away from some trouble. The blog makes everybody's life colorful.
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