题目

Polly's family had just moved to Tampines. They had a new house there. Polly liked her new house. It was bigger than the old one. But she was not happy about having to go to a new school. Her old school was too far away. Polly had many friends in the old school~ She did not know anyone in the new school.       On her first day, Polly was very shy. She did not talk to .anyone in the class. She sat at the back of the class. She did not feel very happy. Mrs Sarip, the class teacher, asked Julie to take Polly to the bookshop to buy some exercise books. Julie held Polly's hand and took her dow11．镁原子的原子结构示意图为，它的最外层有2个电子．镁原子容易失去（填“得到”或“失去”）电子变成镁离子．