45. They have developed techniques which are _______ to those used in most factories.. 
A. more                          B. better 
C. greater                         D. superior
答案：D 固定搭配。题干中并没有比较级的用法，可以排除A、B、C三项，而且Superior to是一个固定搭配，所以应选D。

PartⅢ  ldentification
46. I’m [old enough][not to] let my troubles [to interfere] [with] my work.
       A         B                   C         D
答案：C 使役动词。Let为使役动词，后面跟不带to的不定式，所应应该把C项的to去掉。 

47. [It was] [in the] primary school [where] my teacher introduced
    A      B                  C  
[me to] computers. 
  D
答案：C 强调句。强调句的句型是It is…that 。

48. [Where] did the accident [in which] your friend [was hurt] [took place]? 
   A                     B                  C        D
答案：D 动词。在疑问中主动词提前，后面的动词用原形。took place 改为take place 。

49. [There are] twelve people [take part in] the experiment, four
      A                     B             
[working] [as a] group. 
  C      D
答案：B 分词。因为这是一个句子，所以只能有一套主谓宾，应把B项中的take part in改为现在分词用来修饰People。 

50. [Red and green] light, [if mixing], [in] the right proportion, [will]
      A                 B      C                   D
give us yellow. 
答案：B 被动。颜色和混合之间是被动的，应把B项中的mixing改为 mixed 。

51. We [strongly] suggest [that] Smith [is told] about [his] physical
       A             B           C         D