阅读下面的短文，并根据短文后的要求答题（请注意问题后的字数要求）

My name is Wang Kun. Ever since middle school, my sister Wang Wei and I have dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college， we finally got the chance to take a bike trip. I asked my sister, "Where are we going?" It was my sister who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.

I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn’t know the best way of getting to places, she insisted that she organize the trip properly. Now I know that the proper way is always her way. I kept asking her, “When are we leaving and when are we coming back?” I asked her whether she had looked at a map yet. Of course she hadn’t; my sister doesn’t care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look –the kind that she said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be excited about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once she has ________________, nothing can change it. Finally I had to give in.

86. What are the writer and her sister planning to do? (Within 10 words)

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87. Which sentence in the text is the closing meaning to the following one?

I like my sister very much except that she has a shortcoming.

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88. Fill in the blank with proper words.   (Within 10 words)

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89. Did Wang Kun think the trip would be difficult or easy？and why？（Within 30 words）

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90. Translate the underlined sentence into Chinese.

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