649.The authors of computer viruses are geniuses.
I agree.If they applied their wisdom to other net technology ______ human beings can benefit,it would be better.

A.in which
B.through which
C.from which
D.during which

650.Go _______ the gate and you'll find the entrance _____ the park ________ the other side.

A.through;to;on
B.along;of;on
C.down;to;at
D.up;of;by

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