问两道GWD24的题目

yushixin_1

发现自己手里的GWD24对应的详解从第十套开始和整套题目都对不上。
GWD-24-Q 19:among在这道题的用法有点儿拿不准啊

In archaeology, there must be a balance between explanationof the value and workings of archaeology, revealing the mysteries of past and present cultures, and to promote respect forarchaeological sites.

EB

1. between explanation of the value and workings of archaeology, revealing the mysteries of past and present cultures,and to promote
   
   
2. among explaining the value and workings of archaeology,revealing the mysteries of past and present cultures,and promoting
   
   
3. between explaining the value and workings of archaeology,revealing the mysteries of past and present cultures,and when promoting
   
   
4. among explaining the value and workings of archaeology, therevelation of the mysteries of past and present cultures,and to promote
   
   
5. between explaining archaeology’s value and workings, in therevealing the mysteries of past and present cultures,and in promoting
   为什么是among呢？是因为woriking是复数？among有什么特殊用法没？
   
   GWD-24-Q 20:
   
   
   
   According to a 1996 survey by the National Association of College andUniversity Business Officers, more than three times as many independentinstitutions of higher education charge tuition and fees of under $8,000 a
   
   year than those that charge over $16,000.
   
   DE
   
   
   
   1. than those that charge
      
      
   2. than are charging
      
      
   3. than to charge
      
      
   4. as charge
      
      
   5. as those charging
      
      
   
   
   

yushixin_1

感觉20题的E项不大平行啊，而且国外的一个论坛上也有支持E的不少童鞋。