有一个英语问题,两个不可数名次放在一起用are吗?

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有一个英语问题,
两个不可数名次放在一起用are吗?

当and或both…and…连接两个不可数名词或可数名词作主语时,谓语动词用复数形式.但如果并列的两个名词指的是同一个人,同一个事物或一套事物时(第二个名词前往往没有冠词),谓语动词要用单数.
例1.Plastic and glass are both useful in industry.
A cart and a horse were seen in the distance.
例2.A cart and horse was seen in the distance.