问题
名词解释
放射性同位素
答案
参考答案：有的同位素其原子核不稳定，会自行放射出能量，即具有放射性，称为放射性同位素。
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放射性同位素
参考答案：有的同位素其原子核不稳定，会自行放射出能量，即具有放射性，称为放射性同位素。
Dear Nancy, You asked about places to go and things to do in our town. The Downtown Mall is always 51 . It’s a 52 place in the oldest part of town. There are some good stores and restaurants there. 53 , Trendy Clothing Store is in Downtown Mall. It’s a fun place to shop, and it has the 54 quality clothes. The shop assistants are friendly 55 people. My favorite 56 in town is Nick’s Restaurant. It is close to my house. It’s cheap and the hamburgers there are great. I like Dragon City Restaurant, 57 . You can eat wonderful noodles there and the beef noodles are the most delicious! You must try the dumplings there, too. But it’s more expensive than Nick’s. The Big Cinema is the best cinema in town. It has the biggest screen and the most 58 seats. The Del Ray Complex is also a good place to see movies. It doesn’t have the 59 movies, but the tickets are the cheapest. Anyway, there are lots of things to do and to see here. Come for a 60 soon! Love, Kate
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