WaterhadalsoappearedontheotherplanetslikeMarsbut,

问题详情：

Water had also appeared on the other planets like Mars but, _____51_____ the earth, it had disappeared later. It was not immediately obvious_____52_____ water was to be _____53_____ to the development of life. ____54____ many scientists believe is that the continued____55____ of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.

That afternoon ____56____ the train, the cousins _____57_____ in their seats. Earlier that day, when they crossed the Rocky Mountains, they _____58_____ catch sight of some mountain goats and even a grizzly bear and an eagle. …… Many of them have a ____59____ for riding wild horses and can win thousands of dollars in _____60_____.

【回答】

51. unlike     

52. that       53. fundamental      

54. What       55. presence      

56. aboard      57. settled down   

58. managed to   

59. gift       60. prizes

知识点：语法填空

题型：未分类