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【单选题】
下列关于细胞分化、衰老、凋亡和癌变的叙述，正确的是（） ①个体发育过程中细胞的衰老对生物体都是有害的 ②正常细胞癌变后在体外培养可无限增殖 ③由造血干细胞分化成红细胞的过程是可逆的 ④癌细胞容易在体内转移，与其细胞壁上糖蛋白等物质减少有关 ⑤人胚胎发育过程中尾的消失是细胞凋亡的结果 ⑥原癌基因和抑癌基因的突变是细胞癌变的内因 ⑦低温引起的细胞冻伤和死亡属于细胞坏死A.
1种
B.
2种
C.
3种
D.
4种
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【单选题】If the price of the capital intensive product rises more than does the price of the land intensive product, then
A.
the relative price of the capital intensive product will fall to some point between the pretrade relative prices.
B.
demand will shift away from the capital-intensive product, and its production will decrease.
C.
demand will shift away from the capital-intensive product, and its production will decrease relative to that of the land intensive product.
D.
the production of the capital-intensive product will decrease, but by less than production of the land-intensive product.
E.
the country that exports the capital-intensive good will lose its comparative advantage.
【简答题】请根据画家算法的原理简述画家算法的优缺点
【简答题】简述画家算法的原理。
【单选题】听力原文：W: My suggestion is that if you want to learn English well, watching the news on TV is a good way. M: You're partly right. I think it'll be especially helpful when you check the same information ...
A.
Reading is more helpful than watching TV.
B.
Watching TV is better than reading a newspaper.
C.
A combination of reading and listening is most effective.
D.
The newspaper is a good source for learning English.
【简答题】汽化段数是指：原油的加工过程中（）.
【简答题】关于画家算法的叙述,错误的是( ) A原理比较简单。 B能处理相互穿透的面。 C属于物体空间和图像空间的消隐算法 D画家算法的关键是如何对场景中的物体按深度排序,建立深度优先级表。
【单选题】According to the writer， the responsibility for the kid‘s watching television and watching it for a long time should be undertaken by__________. 查看材料
A.
the television stations
B.
the society
C.
TV programs
D.
their parents
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