在一组单词中，查找出所有长度最长的单词，如果给定的一组单词是："cad","VB","Python","MATLAB","hello","world"则输出结果为： the longest words are: Python MATLAB

要查找一组单词中的最长单词，可以遍历所有单词并记录最长的单词。以下是一个Python的实现：

words = ["cad", "VB", "Python", "MATLAB", "hello", "world"]

# 初始化最长单词为空字符串
longest_word = ""

# 遍历所有单词，如果当前单词比已知最长单词更长，则更新最长单词
for word in words:
    if len(word) > len(longest_word):
        longest_word = word

# 输出最长单词
print("The longest words are: ", end="")
for word in words:
    if len(word) == len(longest_word):
        print(word, end=" ")
print()