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519.So far we have done a lot to build a low-carbon economy,but it is _______ ideal.We have to work still harder.
A.next to
B.far from
C.out of
D.due to
520.We give dogs time,space and love we can spare,and ________,dogs give us their all.
A.in all
B.in fact
C.in short
D.in return
