填空题 <iframe src="/module/audioplay.html?objectid=91a897a2657c5291981f2802c851375c"></iframe>Amazon river in northern South America, largely in Brazil, 1.__________ as the largest in the world in terms of watershed area, number of tributaries, and volume of water 2. __________. Measuring 6,400 km (4,000 mi) from source to mouth, it is second in 3. __________only to the Nile among the rivers of the world. With its hundreds of tributaries, the Amazon drains a 4. __________ of more than 6 million sq km (2.3 million sq mi), 5. __________ half of which is in Brazil; the rest is in Peru, Ecuador, Bolivia, and Venezuela. It is 6. __________ that the Amazon discharges between 34 million and 121 million liters (9 million and 32 million gallons) of water per second and 7. __________ a daily average of 3 million tons of sediment near its mouth. The annual 8. __________from the river accounts for one-fifth of all the fresh water that 9. __________ into the oceans of the world. The outpouring of water and sediment is so vast that the salt content and color of the Atlantic Ocean are 10. __________for a distance of about 320 km (about 200 mi) from the mouth of the river