问题
单项选择题 A1/A2型题
肿瘤发生的始动因素是（）
A.遗传因素
B.环境因素
C.个人的生活方式
D.基因多态性
E.其他
答案
参考答案：D
解析：
目前认为肿瘤为一种基因病。
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肿瘤发生的始动因素是（）
A.遗传因素
B.环境因素
C.个人的生活方式
D.基因多态性
E.其他
参考答案：D
解析：
目前认为肿瘤为一种基因病。
I lived on a farm with my parents and my elder brothers and sisters when I was a little boy. We had the 36 to play and run wherever we wanted to go. We often 37 games just by pretending we were cowboys. Sometimes we played hide-and-seek. One of us would 38 and the others would come and find him. I remember one 39 I hid behind some old wood in the cottage. All was 40 . I couldn’t hear a sound, just the wind 41 . The situation became tense (紧张的) 42 the possibility of someone finding me, and the longer I 43 , the more tense I became. 44 , I heard footsteps coming down the yard. My 45 beat fast and I stood 46 , frozen like a block of ice. I saw my brother getting closer and closer. When he saw me, he laughed 47 , shouting at the top of his voice so that 48 could hear him say, “Eh, I’ve 49 our Tommy!” I can still see the 50 on his face today. Afterwards he said he didn’t think I would hide there. I shrugged my shoulders and said, “Why, it’s a good place, isn’t it?” I don’t have any 51 of these events, just memories, as we had no camera at that time. 52 it was a long time ago, I can see them now as if they 53 yesterday. Now I live in town on a busy street. My girls don’t have the freedom that we 54 have to run off down the road and play whatever they want. Anyway, is it 55 to let children out of sight these days?
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