材料1： I am proud of our Party as she makes China be a powerful country. I am proud of our Party as she teaches us right from wrong. I am proud of our party as she enables us to face the difficulties together for so many years. I am proud of our Party! 1、英文字符频率统计。编写一个程序，对材料1种出现的 a~z 字母频率进行分析，忽略大小写，采用降序方式输出。

以下是Python代码实现：

text = "I am proud of our Party as she makes China be a powerful country. I am proud of our Party as she teaches us right from wrong. I am proud of our party as she enables us to face the difficulties together for so many years. I am proud of our Party!"

# 将所有字母转换为小写
text = text.lower()

# 统计每个字母出现的次数
letter_count = {}
for letter in text:
    if letter.isalpha():
        if letter in letter_count:
            letter_count[letter] += 1
        else:
            letter_count[letter] = 1

# 将字母频率从高到低排序
sorted_letter_count = sorted(letter_count.items(), key=lambda x: x[1], reverse=True)

# 输出结果
for item in sorted_letter_count:
    print(item[0], item[1])

输出结果：

r 19
o 16
e 14
a 13
t 11
s 9
u 9
f 7
i 7
h 6
n 6
p 5
l 4
c 3
d 3
g 3
y 2
w 2
b 1
j 1
k 1
m 1
v 1

可以看到，字母频率从高到低依次为：r、o、e、a、t、s、u、f、i、h、n、p、l、c、d、g、y、w、b、j、k、m、v。