题目内容：

Researchers find that1.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 quality2. the ocean. But new research by scientists from some countries 3. (show) the storms also can do some good. 4.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 important5.(provide) of fertilizer. “Yes, it’s6.(surprise) because of the huge amount of dust and phosphorous(磷), 7. is a nutrient that plants need8.(grow),” one of them says.

In fact, the phosphorous9.(fall) from the sky is about the same as the amount that rivers carry out each year. The thick rainforest and the desert dust 10.(join) together on one small planet.