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

A.
between explanation of the value and workings of archaeology, revealing the mysteries of past and present cultures,
and to promote

B.
among explaining the value and workings of archaeology,
revealing the mysteries of past and present cultures,
and promoting

C.
between explaining the value and workings of archaeology,
revealing the mysteries of past and present cultures,
and when promoting

D.
among explaining the value and workings of archaeology, the
revelation of the mysteries of past and present cultures,
and to promote

E.
between explaining archaeology’s value and workings, in the
revealing the mysteries of past and present cultures,
and in promoting

B 为什么可以用among,  后者是两个而已啊, explaining the value and workings of archaeology.  

Discussion of greenhouse effects has usually focused on whether the
Earth would warm and by how much, but climatologists have indicated all
along that the most obvious effects, and those that would have the largest impact on people, would be extremes of temperature, precipitation,
and storminess.

A.
the most obvious effects, and those that would have the largest
impact on people, would be extremes of temperature,
precipitation, and storminess

B.
the effects that are the most obvious ones, extremes of temperature, precipitation, and storminess, would be those impacting
the most on people

C.
those effects to have the largest impact on people, extremes of
temperature, precipitation, and storminess, are what are the most obvious effects

D.
extremes of temperature, precipitation, and storminess, the most
obvious effects, that they would have the largest impact on people

E.
extremes of temperature, precipitation, and storminess, which are
the most obvious effects, are those to impact the most on people

答案是C , 但我第一个就排除C 了，  因为我觉得C 句的主干 就是those effects    are what are the most obvious effects .    好象读不通哦 , 但其他选项目如何排除, 我也实在是不得要领.   

In archaeology, there must be a balance between explanation
of the value and workings of archaeology, revealing the mysteries of past and present cultures, and to promote respect for
archaeological sites.
A.
between explanation of the value and workings of archaeology, revealing the mysteries of past and present cultures,
and to promote
B.
among explaining the value and workings of archaeology,
revealing the mysteries of past and present cultures,
and promoting
C.
between explaining the value and workings of archaeology,
revealing the mysteries of past and present cultures,
and when promoting
D.
among explaining the value and workings of archaeology, the
revelation of the mysteries of past and present cultures,
and to promote
E.
between explaining archaeology’s value and workings, in the
revealing the mysteries of past and present cultures,
and in promoting
原文说的是在三者之间，即 among explaining, revealing and promoting.

Discussion of greenhouse effects has usually focused on whether the
Earth would warm and by how much, but climatologists have indicated all
along that the most obvious effects, and those that would have the largest impact on people, would be extremes of temperature, precipitation,
and storminess.
A.
the most obvious effects, and those that would have the largest
impact on people, would be extremes of temperature,
precipitation, and storminess
这个答案应该很好排除，这个结构很混乱，闹不清到底是怎么个关系，those在这里指代太混乱了。
B.
the effects that are the most obvious ones, extremes of temperature, precipitation, and storminess, would be those impacting
the most on people
这个结构也很混乱would be those impacting the most on people。impact自己本来就能做名词，在这里用Impacting肯定不好
C.
those effects to have the largest impact on people, extremes of
temperature, precipitation, and storminess, are what are the most obvious effects
what做名词性从句，很清楚的表达了文章的意思，就是。。。。影响是最显著的影响，我自己觉得those effects are the most obvious effects也应该可以，但是跟其他比这个已经是最靠谱的答案了，所以选C
D.
extremes of temperature, precipitation, and storminess, the most
obvious effects, that they would have the largest impact on people
划线跟在that后边，应该是个从句，D答案不是从句，排除
E.
extremes of temperature, precipitation, and storminess, which are
the most obvious effects, are those to impact the most on people
which在这里指代不清，which应该是指代前边所有的extremes of t,p and s，在这里可以被理解成为指代storminess。另外are to这个结构好像也不是ets喜欢的