题干

2015年2月3日,英国国会表决同意允许医学界利用3个人的基因共同育子,成为全世界第一个准许“三亲育子”的国家.“三亲育子”技术是将父母细胞核基因与一位妇女捐赠者的健康线粒体结合在一起,引入的基因只占婴儿总基因的0.1%.这项技术旨在防止因线粒体基因缺陷引起的严重遗传疾病.下列相关描述正确的是(  )

A:线粒体基因缺陷引起的遗传病是母系遗传病,传女不传男

B:“三亲育子”可能会用到人工授精技术、胚胎移植技术等

C:通过“三亲育子”技术得到的“三亲婴儿”的健康线粒体基因不一定能传给其后代

D:若父亲患有线粒体基因缺陷病,需要通过“三亲育子”技术避免将有缺陷的基因传给下一代

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C

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    The road in front of my school is not very wide. Every afternoon when school is over, the road becomes very crowded as children, bicycles, cars and buses fill the road. Sometimes a policeman is there to help control the traffic. However, we still have to be careful enough to stop accidents from happening.

    I am always careful when I cross the road because I ever witnessed (目击) a terrible accident. It happened just after school .As usual, the road was full of traffic. Children were running across the road to get to their cars and buses. When the traffic lights turned red, I stopped to wait, but I saw a little boy running across the road .At this moment, a car came and hit him. The boy fell and lay on the ground.  Fortunately, the car was not moving very fast and the driver successfully stopped the car before it could run over the fallen boy.

    At that time all the traffic stopped. I ran to the boy and saw some blood on the road. His head was hurt . A woman came and examined the boy. Then she lifted him and carried him to her car. They hurried to the hospital. Many people crowded around the driver who looked perplexed (糊涂的),and his face turned white. Later a policeman came and calmed the situation downAs there was nothing I could do, I left the place where the accident happened and walked down the road carefully.

    It's terrible to witness an accident. I don't think I can forget it. Certainly, I would not like to get into one. So I have to be more careful in the future.