TPO12 water in the desert第四题求教。。

everimmortalUID: 2960189

Arid lands, surprisingly, contain some of the world’s largest river systems, such as the Murray-Darling in Australia, the Rio Grande in North America, the Indus in Asia, and the Nile in Africa. These rivers and river systems are known as "exogenous" because their sources lie outside the arid zone. They are vital for sustaining life in some of the driest parts of the world. For centuries, the annual floods of the Nile. Tigris, and Euphrates, for example, has brought fertile silts and water to the inhabitants of their lower valleys. Today, river discharges are increasingly controlled by human intervention, creating a need for international river-basin agreements. The filling of the Ataturk and other dams in Turkey has drastically reduced flows in the Euphrates, with potentially serious consequences for Syria and Iraq.

4. According to paragraph 2. Which of the following is true of the Nile River?

○The Nile's flow in its desert sections is at its lowest during the dry season

○The Nile's sources are located in one of the most arid zones of the world

○The Nile's annual floods bring fertile silts and water to its lower valley

○The Nile's periodic flooding hinders the growth of some crops

我选B 标准答案C 为什么？  B为啥错 C为啥对

咖啡盐UID: 2973669

Arid lands, surprisingly, contain some of the world’s largest river systems, such as the Murray-Darling in Australia, the Rio Grande in North America, the Indus in Asia, and the Nile in Africa. These rivers and river systems are known as "exogenous" because their sources lie outside the arid zone. They are vital for sustaining life in some of the driest parts of the world. For centuries, the annual floods of the Nile. Tigris, and Euphrates, for example, has brought fertile silts and water to the inhabitants of their lower valleys. Today, river discharges are increasingly controlled by human intervention, creating a need for international river-basin agreements. The filling of the Ataturk and other dams in Turkey has drastically reduced flows in the Euphrates, with potentially serious consequences for Syria and Iraq.

咖啡盐UID: 2973669

B的问题在于它的程度错误

everimmortalUID: 2960189

3# 咖啡盐
恩 thx