关系代词和关系副词引导定语从句.Relative pronouns and adverbs introduce attributive clauses.请用线画出短文中的名词性从句.Please underline the noun clauses in the passage.使用书上的if从句.Use the if clauses on these pages....
缩成皱纹的,小园齿状的, 它们的航线上, 下, 和穿过犹他州.Corrugated , crenulated, they course up, down, and across Utah.鲸鱼用它们栉齿状的牙齿来捉浮游生物.Whales use their pectinate teeth to gather plankton....