关于场强和电势，下列正确的（   ）

阅读短文，下列问题

Dear Liz,

    My stay in Thailand has certainly been the experience of my life.

Life is busy and exciting. Bangkok is just like any other big city with a population of 10 million and heavy traffic. I'm very lucky because my host family is in a nice quiet area outside the city. There are Mr. and Mrs. Phairat,their son Sanan, who is 18,the daughter Chinda, who is 16, and Grandpa and Grandma.

    I go to an international school with Sanan and Chinda. The school teaches about 70 percent in English, and 30 percent in Thai. I've learned some spoken language, but Thai writing is very difficult. The cooking lesson is my favourite. I'm learning all about Thai food and culture. People don't use chopsticks here, but spoons and forks. When I come back, I'm going to cook you a real Thai meal.

    Last weekend we visited some temples. We also drove to Pattaya beach near Bangkok. I thought it was great, but Sanan and Chinda say that next month they're taking me to Phuket Island, where the beaches are even more beautiful. The month after next, we're going to travel to Mr. Phairat's hometown in the north of Thailand. The Phairats own land there, and they have two elephants. I'm going to ride those elephants—and even wash them. Sanan and Chinda say it's really fun.

I'm amazed by everything in this country, especially by the elephants. Elephants are an important part of Thai culture and way of life.They have been a traditional symbol （象征） of Thailandfor many years in times of war and peace. In the seventh century, a Thai king trained 20,000 elephants for battle. I'll tell you all about my Thai boxing（拳击）lessons next time I write.

Love,

Mandy

    On a cold evening with snow floating in the air, I got ____ (stick) on the road because of a flat tire(轮胎). I attempted ____ (seek) help from the passing cars, but no one stopped. As I was about to give up hope, a man ____ (drive) an old dirty car came to my aid. To be honest, I was scared when he first approached me. Eying him up and down, I thought to myself, “There is a very good chance ____ he may rob me,” He seemed to have sensed my discomfort so he tried to ease my ____ (anxious) by introducing himself. His act of kindness made me feel ashamed to have questioned his intentions. ____ was really considerate of him to stop to help a perfect stranger like me, especially in such terrible weather. Thus, after the spare tire was fitted, I asked ____ much I owed him. I wanted to pay him back. ____ (surprising), he did not take my offer but rather told me to pass the act of kindness forward and help more people ____ need. As he said those words, I noticed him wearing a smile of contentment. Helping  others seemed a very ____（nature）thing to him. I witnessed the true beauty of human nature in him.