从供选择的答案中，选出应填入下面英语语文句中{ }内的正确答案，把编号写在答卷的对应栏内。

　　One of the guidelines in writing the C code for a software tool is as follows: write code that is as clear and as simple as { A }. The C language can be difficult to read if you combine all { B }features in a single statement. Break complicated { C }into several easy to understand statements for the { D }of readability. This style helps to make your programs more { E } and error-free.

　　供选择的答案

　　A～E：①readable ②reusable ③Possible ④semantic

　　⑤syntactic ⑥constructions ⑦safe ⑧impossible

　　⑨sake ⑩structure

　　【解析】

　　优易学网站提示参考译文：为软件工具写C程序源码的一个规则如下：写的程序尽可能清晰、简单。如果你把所有句法特征组合在单个语句中，C语言将会很难读。为了提高可读性应打破复杂结构，将其分为几个易于理解的语句。这种风格有助于使你的程序更加可读，而且不出错误。

　　【答案】A：③ B：⑤ C：⑥ D：⑨ E：①