题目

On a wild mountain, two goats met on a road just over a high cliff(悬崖). The road was so narrow that there was neither room for them to pass each other nor to turn round and go back. What do you think the two goats did?One of them with great care laid himself down on the narrow road, pressing as close to the rock as he could. Then the other goat softly walked on his friend, safely passed him, he could lightly jump away.The goat that had lain down then stood up slowly from his place, safe and sound, free to jump again from rock to rock, and enjoyed the sweet grass on the hills happily.Howeve将O型血连续输给B型血患者，将使该患者 [　　] A．基因改变，血液变为O型血 B．基因不变，血液变为O型血 C．基因、血液均无改变 D．以上均有可能