还是很难区分above over这两个词

还是很难区分above over这两个词
( ) 1We can see a river running to the east____ the hill,.; ,
A.under B.below C.over D.on
( ) 2 Do you see the kite(风筝) ___ the building.
A.over B.across C.on D.above
这2题如何选择,为什么?
1,2题的答案是BD
如果是这样的提问:
do you see the plane________the building
A.over B.across C.on D.above
这个又怎么选呢?
和上面的题2是同一类型的吗?