同义句,美国教材New horizons in english的platinum is the most expensive metal in the world=platinum is —— —— —— —— —— in the world（6个格子）

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同义句,美国教材Newhorizonsinenglish的platinumisthemostexpensivemetalintheworld=platinumis——————————intheworl

同义句,美国教材New horizons in english的platinum is the most expensive metal in the world=platinum is —— —— —— —— —— in the world（6个格子）
同义句,美国教材New horizons in english的
platinum is the most expensive metal in the world=platinum is —— —— —— —— —— in the world（6个格子）

同义句,美国教材New horizons in english的platinum is the most expensive metal in the world=platinum is —— —— —— —— —— in the world（6个格子）
platinum是铂,俗称白金,化学式是Pt,式量195,贵金属之一,银白色的金属或黑色粉末,质软,有延展性.溶于王水（硝酸和盐酸的混合物）；不溶于水和无机酸,就算是强氧化性的含氧酸也不能溶解它.它的密度是2147千克/立方米.铂有很高的化学稳定性,所以它的化合价一般是零价,只有在一定的条件下,它可以和一些单质和化合物反应,化合价变成+2、+4或+6价.
这句话可以用比较级来改写,六个格子填“more expensive than any other metal”,因为铂金也是金属的一种,所以用any other metal,因为一个事物与其它事物比较时,被比较的事物应该是不包括本身的.any other metal（其它任何一种金属单质）不包括“铂金”本身.希望我能帮助你解疑释惑.

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