— I hear Susan eats little or for supper.
— It's really bad for her health. Why not exercise more to lose weight?
A：nothing
B：something
C：anything
D：Everything
已知相交两圆的半径分别为4和7，则它们的圆心距可能是（ ）
下列各项中，能证明基因与染色体具有平行关系的实验是（ ）
