Waterisimportantinseveraldifferentways.Mostpeopleneedaboutfivetosevenlitresofwatereveryday,butweneednotdrinkthis（18）becausealotcomesfromthefoodwehave.18.A.amountB.numberC.quantityD.scale为什么选A其他3个

Question

Water is important in several different ways.Most people need about five to seven litres of water every day,but we need not drink this （18） because a lot comes from the food we have.
18.A.amount B.number C.quantity D.scale
为什么选A
其他3个选项什么时候用合适,说下理由
If we don't have enough water,however,we will fell tired and (19) become ill
19.A.must B.ought to C.may D.should
选C
为什么B不对

Answer 1

1. number 和 quantity都是可数的量, water不可数
scale 是指比例和规模
所以说水的量用amount最合适,amount可以跟不可数名词搭配使用
2 ought to = should 是应该的意思,不是我们“应该”会生病,是如果喝不够水,我们“可能”会生病
may可能