题目

根据短文内容和所给中文提示，写出空白处各单词的适当形式，每空限填一词。 George Stephenson was born in 1781 in a   1    （贫穷的） family. He had to start work when he has only   2   （八） . When George was fourteen, he became his father’s helper. He spent a lot of time  3   （学习）about engines. And on holidays he often made one engine to pieces and studied each piece   4   （仔细地）. Soon he became a very good worker   5    （虽然）he could not read or write. He began to learn English letters when he was se有植物界的熊猫和鸽子树之称的中国特有珍稀植物依次是（ ）A. 银杏，银杉 B. 银杉，珙桐 C. 银杏，珙桐 D. 水杉，珙桐