[例6]
People often think Dimetrodon is a dinosaur(恐龙),but it was in fact _n_(1)_____ a dinosaur at all. It was one of the reptiles(爬虫动物)on Earth during the _l_(2)_____ Permian(二叠纪)period.
It was a large reptile. It lived in swampy(沼泽的) areas and had a very funny _ f_(3)_____ ---a large sail(脊鳍)on its back. Dimetrodon was a (4) to warm up in the morning and cool off _q_(5)____ ——during the day with the help of its sail.
It's easy to distinguish(区分)a Dimetrodon _ f_(6)______ a dinosaur. Dimetrodon's legs were on the side of its body while dinosaurs had their legs under their bodies.
It probably ran very fast _a_(7)____ it was very heavy.
【解析】
第一格填not。根据前半句人们经常认为是一种恐龙，但事实上它并不是，but表达转折与前句的否定。
第二格填late。表达时间是很清楚的，这种动物在二叠纪时期的后期出现，所给首字母是l，而不是e。如果是早期出现，那么应填early。
第三格填feather。本题所缺词性为名词，讲这种爬行动物的后背有一个大的脊鳍，这是讲它的特征。
第四、第五格分别填able和quickly。表达这种动物的脊鳍的作用：可以早上暖和，白天又很快地冷却。Be able to是固定搭配。
第六格填from。从语法角度看，distinguish只能与from搭配。
第七格填although。上句It probably ran very fast和下句it was very heavy.推断两句为转折承让关系。因此填although。
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（责任编辑：zjc）