Researchersfindthat

问题详情：

Researchers find that___41___large amount of African dust can blow all the way across the Atlantic Ocean and fall on North and South Americas.

African dust storms can harm air quality_____42_____the ocean. But new research by scientists from some countries_____43_____ (show)the storms also can do some good.____44____is found that an average of 28 million metric tons of Saharan dust falls in South America’s Amazon River basin each year. Scientists say the dust is an important____45____(provide) of fertilizer. “Yes, it’s_____46_____(surprise) because of the huge amount of dust and phosphorous(*),___47___ is a nutrient that plants need_____48_____(grow),” one of them says.

In fact, the phosphorous_____49_____(fall) from the sky is about the same as the amount that rivers carry out each year. The thick rainforest and the desert dust____50____(join) together on one small planet.

【回答】

41. a    42. across   

43. shows    44. It   

45. provider   

46. surprising   

47. which    48. to grow   

49. falling   

50. are joined

知识点：语法填空

题型：未分类