此题要求改正所给短文中的错误。对标有题号的每一行作㈩判断：如无错误，在该行右边横线上画一个勾(／)；如有错误(每行只有一个错误)，则按下列情况改正：
此行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写㈩该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号(八)，在该行右边横线上写㈩该加的词。
此行错一个词：在错的词下划一横线，在该行右边横线上写㈩改正后的词。
注意：原行没有错的不要改。
Dear Editor,
My name is Li Hua. Recently I find more and more difficult to 76.
communicate with our parents on some questions. For example, 77.
I do want to have a relaxing summer vacation, and they want to 78.
send me to some training class. I want to find a part-time job, 79.
but they say I was too young. What's more, they think I can't do 80.
the hard work. I want to do a social survey, but they say that it 81.
is actually waste of time. I am feeling helpless. Would you like 82.
to give me some advice on what is to do with this? I would appreciate 83.
it that I could get your help. I'm sure, with your help, I call solve 84.
these problems easily. I'm looking forward to hear from you soon. 85.
Yours, Li Hua
得到平均发展速度
平均增长速度=平均发展速度-1=16%。因此选C。