We should protect water,for only 3 percent of the world's water _ fresh water.这里为什么是is不是are

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We should protect water,for only 3 percent of the world's water _ fresh water.这里为什么是is不是are
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We should protect water,for only 3 percent of the world's water _ fresh water.这里为什么是is不是are
We should protect water,for only 3 percent of the world's water _ fresh water.
这里为什么是is不是are

We should protect water,for only 3 percent of the world's water _ fresh water.这里为什么是is不是are
water是不可数名词

因为宾语是 water
water 不可数,故用 is。

因为water 是不可数名词作主语

因为water是不可数名词,谓语动词要用单数形式