Theearthwasjust

问题详情：

The earth was just ___41___ cloud of dust after  the “Big Bang”．The earth exploded loudly with fire and rock.___42___ were in time to produce many things，which were to make the earth’s atmosphere. As the earth cooled down，water began to appear on ___43___surface. It allowed the earth to dissolve ___44___(harm)gases. Then life began to develop.

Small plants multiplied and filled the first oceans and seas with oxygen. This encouraged the ___45___ (develop)of early shellfish and fish. Land animals such____46____insects，reptiles and dinosaurs appeared after green plants appeared. Small clever animals spread all ___47___ the earth. They are putting too much carbon dioxide into the atmosphere，___48___ prevents heat from escaping from the earth into space.____49____life will continue on the earth for millions of years to come will depend on whether this problem can____50____ (solve)．

【回答】

41. a    42. They   

43. its    44. harmful   

45. development   

46. as    47. over   

48. which    49. Whether   

50. be solved

知识点：语法填空

题型：未分类