(2013·新课标Ⅰ,32)There's no way of knowing why one man makes an important discovery________another man,also intelligent,fails.
A.
since
B.
if
C.
as
D.
while
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【简答题】As the saying goes, 'Its better to give than to receive' , after seasons and centuries change, do you think it is still a truth? What is your view on this? Write an essay of about 400 words entitled: ...