问题 解答题

有100个连续自然数,请你按某种顺序排列,然后计算相邻三个数的和,其中和为偶数的最多有______个.

答案

奇数+奇数+偶数=偶数,100个连续自然数,奇数和偶数各有50个;按照奇奇偶奇奇偶…(一共25组奇奇偶,还剩下25个偶数)奇奇偶奇奇偶…奇奇偶偶偶偶…

这样排一下,只有中间的一组(奇偶偶)的和,为奇数,其余各组的和都是偶数;和为偶数的,最多有:100-2-1=97个.

故答案为:97.

阅读理解

阅读理解,回答问题。

     As teenagers, you have many dreams. These dreams can be very big, such as winning the Nobel

Prize, or they can be small. You may just want to become one of the ten best students in your class.

Once you find a dream, what do you do with it? Do you ever try to make your dream true?

     Follow Your Heart by Australian writer Andrews tells us that making our dreams true is life's

biggest challenge (挑战).

     In fact, everyone can make his dream come true. The first thing you must do is to remember

what your dream is.

     Don't let it leave your heart. Keep telling yourself what you want. Do this step by step and your

dream will come true faster because a big dream is, in fact, many small dreams.

    You must also never give up your dream.

     There will be difficulties on the road to your dreams. But the biggest difficulty comes from yourself.

You may think you're not very good at some school subjects, or it is impossible for you to become a

writer. These kinds of thoughts stop you from getting your dream, the book says.

     You need to decide what is the most important. Studying instead of watching TV will lead to better

exam results, while saving five yuan instead of buying an ice cream means you can buy a new book. As

you get closer to your dream, it may change a little. This is good as you have the chance to learn more

skills and find new interests.

1. Translate the sentence underlined in paragraph 7 into Chinese.

    ________________________________________________________________________

2. Find out the sentences from the passage that stand for "the biggest difficulty comes from yourself".

    ________________________________________________________________________

3. What should you do if you want to make your dream come true? (至少两条)

    ________________________________________________________________________

4. What's the main idea of the last paragraph?

    ________________________________________________________________________

5. 请给短文拟定一个适当的英文标题。

   ________________________________________________________________________

选择题