题目

Be Grateful to Life Once President Roosevelt’s house was broken into and lots of things were stolen. Hearing this, one of Roosevelt’s friends   1  to him and advised him not to take it to his  2  so much. President Roosevelt wrote back immediately,  3  ,”Dear friend, thank you for your letter to   4   me. I’m all right now. I think I should thank God. This is because firstly, the thief only stole things from me but did not hurt me   5  ; secondly, the thief has   6  some of my things instead of all my things; thirdly, most   7  for me, it was the man   8  me who 孟德尔发现的基因遗传行为与染色体行为是平行的。根据这一事实作出的如下推测，哪一项是没有说服力的( )A．基因在染色体上B．每条染色体上载有许多基因C．同源染色体分离导致等位基因分离D．非同源染色体之间的自由组合使相应的非等位基因重组