求助两道语法题！！！

houhuiliao

有两道题不明白，希望大家帮忙（from OG)
83.Any medical test will sometimes fails to detect (a condition when it is present and indicate that there is one )when it is not.

B.when a condition is present and indicate that there is one
C.a condition when it is present and indicate that it is present
D.when a condition is present and indicate its presence
E.the presence of a condition when it is there and indicate its presence

165.At Shiprock,New Mexico,a perennially powerful girls' high school basketball team has become a path to college for some and a source of pride for a community (where the household incomes of 49 percent of them are) below the poverty lever.

B.where they have 49 percent of the household incomes
C.where 49 percent of the household incomes are
D.which has 49 percent of the household incomes
E.in which 49 percent of them have household incomes

另外，请教大家：the same as 与 the same that 区别；the extent to 区别the extent that;so as to 区别 so that!
先谢了！！ [em22][em22]

猫猫头

83.C，平行对称

165。C。
     AB指代不明，have incomes不妥。。。

另外：the same as后面跟短语，the same that后面跟从句