空间某区域内存在着电场，电场线在竖直平面上的分布如图所示，一个质量为m、电荷量为

五个外国留学生今年七月份想到中国不同的城市旅游，请仔细阅读第56-60题中的个人情况说明，并从A至F六个选项中最适合他们的城市（其中一项为多余选项）。
小题1:Joe comes from Moscow. He has studied in Beijing for two years. So he misses his hometown very much. He hopes to go to a city where he can find the feeling of returning home.
小题2:Mary is an American girl. She likes going shopping. This year she’ll graduate from a famous Chinese college. So she is planning to travel to a city where she may find a job.
小题3:Henry is from Canada. He is interested in surfing and diving(潜水). But the city in which he is living is far from the sea. So he is expecting to get to a place where he can do these activities and taste bananas and pineapples(菠萝).
小题4:Rosa comes from Britain. She cannot stand hot weather. And she thinks some Chinese cities have too much pollution. So she wants to go somewhere clean and peaceful.
小题5:Timmy comes from Japan. He has great interest in taking photos. He is looking forward to staying close to nature. He even wants to take a boat while taking photos. However, he doesn’t like hot food.

A		City: Lasa Temperature in July:15-17°C Attractions: blue sky, fresh air and wonderful dances
B		City: Harbin Temperature in July: 24-30°C Attractions: some old buildings in Russian style
C		City: Chongqing Temperature in July:28-30°C Attractions: tall mountains, hot food and friendly people
D		City: Hong Kong Temperature in July:29-30°C Attractions: nice and cheap clothes, all kinds of tasty food and chances to find good jobs
E		City: Guiling Temperature in July:29-30°C Attractions: fantastic hills, clean rivers and many other natural sights
F		City: Sanya Temperature in July:27-32°C Attractions: exciting water sports, lovely beaches and great tropical(热带的) fruit