有五条线段长度分别为1，3，5，7，9，从这5条线段中任取3条，则所取3条线段能
题型：填空题
问题：
有五条线段长度分别为1，3，5，7，9，从这5条线段中任取3条，则所取3条线段能构成一个三角形的概率为______
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题型：填空题
阅读理解。
Nancy's hobby is collecting sharpeners. She spends a lot of time on it after school. She has been
collecting more than one hundred sharpeners from different countries. They are all different in color and
size.
Nancy likes sharpeners with animals on them. In this way, she learns the names of many animals. She
also borrows books on animals from her school library. She learns a lot about them from books.
Sometimes Nancy has many sharpeners of the same kind. She gives them to her friends. Then they
give her other different sharpeners in return (回报) .
Nancy has many pen pals in many countries. She sends them sharpeners of her country. In return,
they send her sharpeners of their countries. Nancy's father also gives her sharpeners. He brings them
home from different places for her.
Many of Nancy' s friends collect other things. Some collect coins and others collect match boxes or
stamps. But, all of them say that Nancy's collection is the most interesting of all.
1. Nancy spends a lot of time on her hobby _____ .
A. before school
B. in class
C. after school
D. during her holidays
2. _____ Nancy' s sharpeners are different in color and size.
A. All of
B. Some of
C. Many of
D. Most of
3. How does Nancy collect sharpeners? Which of the following is NOT true?
A. Her friends give her some.
B. Her pen pals send her some.
C. Her father brings her some.
D. Her father's friends give her some.
4. Sometimes Nancy has many sharpeners of the same kind. She then _____ .
A. keeps them
B. throws them away
C. sells them
D. sends them to her friends
5. What do Nancy's friends collect?
A. Sharpeners.
B. Coins.
C. Match boxes.
D. Both B and C.