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增加：在缺词处加一个漏字符号（∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(\)划掉。
修改：在错误的词下划一横线，并在该词下面写出改正后的词。
注意：
1.每句不超过两处错误；
2.每处错误及其修改均仅限一词；
3.只允许修改10处，多者（从第11处起）不计分。
Dear Mr. Donforth,
I’m writing to ask you come to our class for a visit. I’ve heard that you have been to the China. In our China unit, we have learned about it’s rich culture and long history. Because you have visited China some times, I would like to know if or not you have seen the old buildings there. Although we have learned a lot from the text book, but I believe your personal experiences will be a lot better than the book. Your knowledges of China can help the whole class. Could you share your experiences for us? It will be very excited and interesting. I hoped that you will think about my request and visit us as soon as possibly.
MS. Smith
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
