【单选题】Many dreams______seem impossible, then improbable, and eventually inevitable.
【单选题】We have to filter sensory input into recognizable images because______.
A.
it's impossible for us to process all the existing visual information
B.
what we perceive has to be significant
C.
we have to look at a face in complex shadows
D.
different cultures emphasize different perceptions
【简答题】影响沉积物中重金属释放的主要因素有哪些?
【单选题】I think ______ impossible for him ______ the work without any help. [ ]