两个句子结构求解

1: Green tax has an effect on the environment and natural resource base of countries as varied as China, the Netherlands, and Hungary.

A: as varied as
B: that are as varied as
问:为什么选A,句子是什么意思啊? 为什么不选B呢?

2:

A:  Before scientiest learning how to synthesize the growth homon, it had to be painstakingly removed from ...
B: Before learning  how to synthesize the growth homon, scientiest had to remove it painstakingly from...
问:为什么A对,B错?

1: Green tax has an effect on the environment and natural resource base of countries as varied as China, the Netherlands, and Hungary.

A: as varied as　　　指多种国家，合题意。
B: that are as varied as　　指国家的特征很多样化就象工C，N，H这三个国家多样化一样。歧义。

2:

建议题目要全。仅就目前来看，B的IT指代有问题。

A:  Before scientiest learning how to synthesize the growth homon, it had to be painstakingly removed from ...
B: Before learning  how to synthesize the growth homon, scientiest had to remove it painstakingly from...

Thanks!!