根据短文内容及所给的首字母写出单词（每空一词。共10小题，每小题1分，共10分）
A couple (夫妻) have a son and a daughter, and they are twins (双胞胎). They live in a t 小题1: near Nanjing. Their house is very small with only three rooms. No washing machine, and no f 小题2: to keep food in.
The twins are b 小题3: students. They are in the n 小题4: grade this year. They must do a lot of homework at home. But they don’t have a s 小题5: . They have to do their homework at the dining table. Every morning, they go to school on one bike. And when they are b小题6: from school, they do a lot of housework for their parents.
They live a hard life. But the family is always f 小题7: of fun. They often sit on their old sofa and chat about school life and the children’s beautiful f 小题8: there.
The family becomes famous b 小题9: it donates(捐赠) 2, 000 yuan to Project Hope. When people ask them why they are so generous (慷慨的), the father always says, “We know h 小题10: people feel when their children can’t go to school.”
sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（ ）
W