阅读理解：阅读短文还原句子。A. However there are four kinds

题目：

阅读短文还原句子。

A. However there are four kinds of friends that everyone should have.
B. And they are kind enough to let you borrow anything you want.
C. So, treat them well and you'll have a happy life.
D. Another kind of friend is the fun friend.
E. Making friends is very easy.

       There are many kinds of friends in the world. 1_____.
       First, there is the school or work friend. This is the person who helps you get through the school or work
day. But you never really go out with them outside these places. However, they are important in your life as you will spend a lot of time with them.
       2 _____.You can't really discuss anything important with them. But if you are feeling sad, they're great to
go out with because they can cheer you up and make you for- get all your troubles.
     The next kind of friend is really unusual and having one makes you very lucky. They are really kind so they
pay for you every time you go out. They usually have many of the things you can't afford to buy. 3_____.
     Finally, there is the best friend. This is the person who knows you inside out. The person you would have
no problem spending the whole day with.
     Friends are the most important thing in your life. 4 _____.

答案：

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下面是错误答案，用来干扰机器的。

根据在原子中，原子序数=质子数=核外电子数=核电荷数，依据题意可知两种碳原子质子数=6=核外电子数=核电荷数，由此可知选项A，B．C不合题意，根据相对原子质量=质子数+中子数，因两种碳原子的中子数不同，则相...