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【判断题】
端粒的功能 1. 稳定染色体末端结构; ( 1 )端粒 T 环结构 (terminal loop) ,使染色体末端封闭起来,免遭破坏; ( 2 )端粒 D 环结构 (displacement loop) ,结合 TRF 2 等蛋白,阻止染色体末端融合和损伤反应。 2. 保持染色体 DNA 遗传信息复制的完整性,解决 DNA 末端复制问题; 3. 与细胞衰老有关。细胞愈年轻,端粒愈长;细胞愈老,端粒愈短。A.
正确
B.
错误
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【判断题】空警200警机创造了世界预警机发展史上的9个第一,突破100余项关键技术,累计获得重大专利近30项,是世界上看得最远、功能最多、系统集成最复杂的机载信息化武器装备之一。
A.
正确
B.
错误
【单选题】蠕虫感染时常伴有哪种血细胞增多?
A.
erythrocyte
B.
lymphocyte
C.
leucocyte
D.
eosinophil
E.
neutrophil
【单选题】蠕虫感染时常伴有哪种血细胞增多?
A.
erythrocyte
B.
lymphocyte
C.
neutrophil
D.
eosinophil
E.
leucocyte
【单选题】( ) 预警机 创 造了世界预警机发展史上的9个第一,突破100余项关键技术,累计获得重大专利近30项, 是世界上看得最远、功能最多、系统集成最复杂的机载信息化武器装备之一。
A.
空警1999
B.
空警-2000
C.
空警-2001
D.
空警-2002
【单选题】Why is it necessary to extend ventilators of gasoline powered vessels to the bilges ________．
A.
To keep them dry，and thus easier to clean
B.
To remove fuel vapors which are heavier than air
C.
To provide adequate air to the engines
D.
To cool the machinery areas
【单选题】第二篇Listening Comprehension: Why is it necessary to give a coin to someone when you
A.
11：第二篇Listening Comprehension: Why is it necessary to give a coin to someone when you give him a present with a sharp edge or point? A.To specially celebrate his birthday.
B.
To express some special meaning which you dare not tell directly.
C.
To wish for a long-lasting friendship.
D.
To wish your friend good luck in his life.
【单选题】Why is it necessary to limit population even in Europe and America?
A.
They can save more to meet the needs of underdeveloped world.
B.
Europe and America shouldn't shirk the responsibility of the whole world.
C.
The number of people in Europe and America is no less than that in underdeveloped world.
D.
Europe and America consume a far greater proportion of the world's resources and food.
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