请教几道语法题

slxflyUID: 2102869

1 For the advertiser,one of the greatest appeals of radio is____an audience all day long.    (a)that it has  (b)that to have (c)to  have it (d)having it
2 THe system of chemical symbols,first devised about 1800,gives a concise and instantly recongnizable description of a element or compound.   答案选b,为什么不选c呢，不应该是an element吗
3 Onyx is amineral that can be recognized its regular and straight parallel bands of white,black,or brown.  答案选a,为什么不选d?
4 It took more than fourteen years to carve the faces of four United States Presidents into the granite cliffs to Mount Rushmore,South Dakota.   为什么选d?
5 In ___ people, the areas of the brain that control speech are located in the left hemisphere.(a)mostly of  (b)most   (c)almost the  (d)the most of  为什么选b不选d？
6 Among the symptoms of measles,which takes about twelve days to incubate,are a high fever,swelling of glands in the neck,a cough,and sensitive to light.

请大家讲解一下，谢谢

powerpycUID: 2180236

1---------------------------------A..好象是习惯用法,不过我用语感能做出来
2-----------------------..应该是选C吧..这是什么题啊?哪年哪道??
3------------------------------这里OR是"或者"的意思,不可能用AND..对了,你把A怎么改的?
4-------------------------------------TO改成IN样,说的是总统山的事吧..
5--------------------------------------------为什么要选D??D说不通
6----------------------------选D,平行结构样,D改成名词,和 FEVER /COUGH 平行

powerpycUID: 2180236

沙发!耶~~~~~~~~~~~~~~~~~

mgtkillerUID: 57770

同意2楼的，3题应该是recognized by吧

powerpycUID: 2180236

恩恩..好象是样..3Q..

na915deyueUID: 2177950

2题就应该选C!上新东方课时老师说过,把B改成C

nick2005UID: 2133114

1-----a表语从句
2-----b平行结构
3------把its去掉
等一会

na915deyueUID: 2177950

2题就是选C.应该是an element
B没有错