Question

一道托福阅读题

The same thing happens to this day, though on a smaller scale, wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows: the water usually spreads out fanwise, depositing the sediment in the form of a smooth, fan-shaped slope. Sediments are also dropped where a river slows on entering a lake or the sea, the deposited sediments are on a lake floor or the seafloor at first, but will be located inland at some future date, when the sea level falls or the land rises; such beds are sometimes thousands of meters thick.

6. All of the following are mentioned in paragraph 3 as places that sediment-laden rivers can deposit their sediments EXCEPT
○A mountain valley
○Flat land
○A lake floor
○The seafloor
麻烦给出正确答案和原因

Answer 1

选A mountain valley。托福阅读有时候不需要认识单词，重在分析。本题问的是EXCEPT，所以马上可以排除最后两个选项，因为它们在倒数第三行是用or连接的，证明地位一致；而a mountain valley 和flat land 在一个句子中： a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows:这个句子中认识emerge from (甚至只要认识from就行）和onto...和drop就够了，从mountain valley到flat land，然后drop，可见是drop到了后者——flat land上，所以选mountain valley。
我是英语老师，专攻阅读，其实阅读最大的障碍有时候不在于生词（托福阅读生词貌似恐怖，让人一下子摸不着头脑），只要会分析，脑子快，很多题一样能做对。

Answer 2

答案： A
这段讲的是河流入海、湖时会形成三角洲。文中有提到当带有泥沙的河流从山谷中流入平原时河流流速减小会dropping its load, 就是泥沙会沉积； 最后一句也说河流在入湖和入海的时候sediments are also drpped. 问题是河流什么时候泥砂不会沉积，因为文中提到了流入平原、湖、海的时候都会沉积，所以答案是A山谷。

Answer 3

A
wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land

emerge from 从...出现