【分析】
本题是人物介绍类英语书面表达题，要求以“My best friend”为题，结合给定的身份、外貌、性格、学习、理想等要点写80词左右的短文。解题思路：1. 开头引出写作对象王珊珊，点明其身份；2. 依次覆盖所有给定要点，选用合适的英语词汇和句式，使用一般现在时；3. 加入适当连接词使文章连贯，控制字数符合要求，保证语言通顺准确。
【解析】
1. 开头点明朋友身份：She is a 15-year-old girl who is both my neighbour and my best friend.
2. 描写外貌：Shanshan has a round face with bright smiling eyes. She is the slimmest girl in her class.
3. 描写性格：Shanshan has a good sense of humour. She likes telling jokes. When I am unhappy, she always makes me laugh. She is also very generous. She is willing to share everything with others.
4. 描写学习情况：Shanshan studies the hardest in her class. She is good at Maths. She always listens carefully to her classmates' problems and gives them help.
5. 描写理想：Shanshan wants to be a teacher when she grows up because she likes working with children.
将以上内容连贯组织，形成符合要求的短文。
【答案】
One possible version：
My best friend
I want to tell you about my best friend named Wang Shanshan. She is a 15-year-old girl who is both my neighbour and my best friend.
Shanshan has a round face with bright smiling eyes. She is the slimmest girl in her class. Shanshan has a good sense of humour. She likes telling jokes. When I am unhappy，she always makes me laugh. She is also very generous. She is willing to share everything with others.
Shanshan studies the hardest in her class. She is good at Maths. She always listens carefully to her classmates' problems and gives them help.
Shanshan wants to be a teacher when she grows up because she likes working with children.
【知识点】
英语书面表达、人物描写
【点评】
本题为初中英语人物介绍类书面表达题，给定明确写作要点，考察学生英语词汇运用、句式表达及篇章组织能力，难度适中，能有效检测学生的英语写作水平。
【难度系数】
0.5