麻烦帮说三个的区别:valuable,precious, priceless 谢谢Human life is _____ , so he makes every effort to make many ___ discoveries in science.A precious ,valuableB priceless , valuableC priceless , precious答案是B

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麻烦帮说三个的区别:valuable,precious, priceless 谢谢
Human life is _____ , so he makes every effort to make many ___ discoveries in science.
A precious ,valuable
B priceless , valuable
C priceless , precious
答案是B

precious形容物所以不能用于人上
那从BC中选,valuable是有价值的,而发现应该是对人类有价值的,而不是珍贵的,所以用B

precious是珍贵的,常用于形容值钱的东西,valuable有有价值,极有用的意思,这一点那两个都表示不出来,所以第二个空非填它不可;priceless是指无价的,比precious还要珍贵。什么能比生命更无价呢?所以填priceless