_____________ is staying at home this summer.
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___________ went to Sanya two years ago.
Anna
B. Stella
___________ always makes her photos into a photo book.
Anna
B. Stella
____________ buys postcards and takes photos of them.
Anna
B. Stella
数学思想是数学方法的进一步( )。
A. 提炼和概括
B. 归纳和总结
C. 归纳和延伸
D. 提升和拓展
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