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Few people would even think of beginning a new job at the age of 76, but one of America's most famous artists did just that. Anna Mary Robertson, better known as "Grandma Moses", turned to painting because she was too old to work on her farm.
Grandma Moses painted carefully and her works were nice. She first painted only to enjoy herself, and then began to sell her works for a little money. In 1939, a collector, Louis Caldor happened to see several of Grandma Moses' works hanging in a shop. He liked them, bought them at once, and set out to look for more. Caldor held a show to introduce the works of Grandma Moses to other artists.
Grandma Moses died on December 13, 1961, at the age of 101. She was world famous.

答案解析：
(1) 正確答案為A。根據(jù)Few people would even think of beginning a new job at the age of 76, but one of America's most famous artists did just that. 很少有人會在76歲的年紀才開始從事一項新工作，但是美國最著名的藝術(shù)家之一便這么做了。可知，摩斯奶奶是在76歲開始畫畫的，因此A項正確。
(2) 正確答案為B。根據(jù)turned to painting because she was too old to work on her farm. 開始畫畫，因為她年紀太大了，不能再在農(nóng)場上工作了。可知，摩斯奶奶在成為藝術(shù)家之前是在農(nóng)場上工作，因此B項正確。
(3) 正確答案為A。文章主要介紹了Anna Mary Robertson（安娜·瑪麗·羅伯遜）這位高齡畫家的故事，因此A項正確。