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zwyywz521

15. A challenging new area in inorganic chemistry is --- the role of transition metals in the biochemical catalysts called enzymes.

(A) that of understanding

(B) to have understanding

(C) the understanding

(D) understanding that

选Ａ　　但是ＴＨＡＴ代表的是什么？？？　　关于这种用法ＴＯＥＦＬ常见吗？？

zwyywz521

37. Among the most complex crystals are that of silicon dioxide, which has seven different structures at various temperatures and pressures, the most common being quartz.

答案：B

这里的ＢＥＩＮＧ怎么理解，多谢能讲清楚点，谢谢谢谢～～～

爱睡觉的猫

37.改为those，指代crystals.后面的which指代silicon dioxide,所以用单数has

参考译文：在最复杂晶体中有二氧化硅的结晶体，二氧化硅在不同温度和压强下有7种不通结构,最常见的是石英。

爱睡觉的猫

A，名词结构，that普通代词，同比较级里that of的惯用法。

B，语法错误 C，分词带宾语不要加定冠词 D，割开了动宾结构，而understanding不能直接带宾语从句。

参考译文：在无机化学中一个新的挑战领域就是理解过渡金属在被称作酵素的生化催化剂中的作用。

xizzhu

以下是引用zwyywz521在2006-4-9 0:52:00的发言：

37. Among the most complex crystals are that of silicon dioxide, which has seven different structures at various temperatures and pressures, the most common being quartz.

答案：B

这里的ＢＥＩＮＧ怎么理解，多谢能讲清楚点，谢谢谢谢～～～

the most commom being quartz   主格