51.Dear Mary：
I‘ve been back this morning. What a tiring but exciting trip.
JiuZhaigou is an excellent place and really worth going. The tour guide led us visited several travelling sites，which made us feet like in heaven. The most wonderful site is the Huohuahai Lake. The water there was so clear that we could see different colors of stones at the bottom，as if the water didn‘t exist except for the pure blue. We also visited the waterfall which was found scene by the famous TV play“Xiyouji”。
How are you at present？Is anything coming along successfully？Don‘t be so occupied with your work，try a little bit to relax yourself. I’m planning to a tour in ZhangJiajie next year. It is said to be another wonderful place to visit.I hope you could go together with me to share the happiness. Please write back to let me know your idea.
Yours Truly，
Jane
September 24th，2004
Part B
52
Be Kind to Our Mother Earth
This depiction is to some extent a heartrending dramatization of our present life. Skyscrapers stand in clusters，and trees lining on both sides of the street are all made of artificial materials. Mankind‘s dwelling place on earth no longer looks green，but is in the colour of gray.
Are we still living in a natural world？Definitely not！With the steps of modernization and mechanization，the serene poetic life of former times has vanished. Vast green pastures are replaced by factories belching out columns of thick smoke；rivers once teemed with all kinds of fishes are now polluted by sewage water. In addition to that，environmental pollution has given rise to a number of serious problems，such as the extinction of some species of animals owing to the desertification，the greenhouse effect owing to the depletion of ozone layer，and the dwindling away of fresh water. Mother earth is the only home we live in. Therefore，she exists more for our protection than for our destruction. Supposing our planet is a vessel made of cake，and it is going to carry us across the ocean to the other side，namely，the paradise. Could we gnaw a hole in the cakevessel and still sail across the ocean safe and sound？On the contrary，my friends，we will get drowned.
Now it is high time that measures be taken to counter the negative effects of modernization. The strategy of sustainable development has been launched，but this is not enough，because it is each citizen‘s business to be kind to our mother earth.
