从 方框中选择适当的单词填空 well-trained, passage, experienced, length, organize 1. The old man is a highly _________ traveller. 2. Mark Twain was once a _________ pilot on the Mississippi. 3. _________ is the long dimension of any object. 4. He read a _________ on rice farmi ng from the geography book. 5. The people _________ to Beijing are waiting for their train.