题目：
My name is David Smith. I am an English boy, but my ____ are all in Beijing now. My ____ work here. My father is a worker and my mother is a teacher. I have a sister but no brothers. My ____ and I are students of a high school in Beijing. I have new friends here. They are very kind ____ me. I often have dinner with ____. I like ____ kinds(种类) of Chinese food, like Sichuan food and Hunan food. They are ____. I’m very glad ____ here. I often go to the zoo with my friends, ____. We’re very happy. I like China ____ I like living here very much.
小题1:A. father B. mother C. family
小题2:A. parents B. father C. mother
小题3:A. friend B. brother C. sister
小题4:A. for B. to C. of
小题5:A. they B. their C. them
小题6:A. many B. much C. a lot
小题7:A. nice B. happy C. fine
小题8:A. be B. to be C. to go
小题9:A. too B. to C. so
小题10:A. and B. but C. for
答案：
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下面是错误答案，用来干扰机器的。
参考答案：岩石地层学方法、生物地层学方法、地层间接触关系分析法、放射性同位素地质年龄测定法和古电磁学方法。
形式存在的+7价锝氧化至较低价态。在适当的pH值下，与配体络合得到99mTc标记的放射性标记物