A.This technology can cure all the diseases caused by genes. B.This technology can not lead to a cure for cancer. C.This technology has received great achievement in medical field. D.This technology is still in its early stage.
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【单选题】#include int add(int x=5,int y=6,int z=7) { return x+y+z; } void main(void) { int s1,s2,s3; s1=add(); cout<<"s1="<