给定一篇英文文章，请编写代码将其中所有单词的首字母大写。

'the quick brown fox jumps over the lazy dog'
以下是Python的代码示例：

```python
s = 'the quick brown fox jumps over the lazy dog'
# 将文章按空格分割成单词列表
words = s.split()
# 对每个单词执行首字母大写操作，并用空格将它们拼接起来
capitalized = ' '.join([word.capitalize() for word in words])
print(capitalized)
```

输出结果：

```
The Quick Brown Fox Jumps Over The Lazy Dog
```