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【简答题】
My favorite great book is The Adventure of Tom Sawyer by Mark Twain. Tom lives with his aunt Polly in a quiet street of St. Petersburg, Missouri. He's a lively and clever young boy, and he finds himself in many exciting adventures ( 冒险 ). He runs away with his two friends, Huck Finn and Joe, to an island in the middle of the Mississippi River for several days. With Huck he goes looking for treasure, with Becky he gets lost in a cave. And finally, they find a box of gold. My favorite scene in the book is when everyone thinks Tom is dead. He decides to go to his own funeral. He hides and watches and then suddenly he appears. Everyone is surprised to see him but they're also pleased to see him alive. Tom is the hero of the story, but there are other important characters. Huck is an outsider and everyone is afraid of him. Becky is pretty with fair hair, Joe is Tom's best friend and Injun Joe is the bad man of the story. The theme of the story is about children growing up. It describes how strangers are seen in small towns of America. Finally, it talks about freedom, social rules and how people are punished for bad behavior. Why do I think The Adventure of Tom Sawyer is a great book? The story was published in 1876, but it's still read and loved by people all over the world today. And although it's only a story, Mark Twain wrote it in the everyday English of the southern states of America in the 19th century, so it sounds very real. Today it's thought to be one of the greatest books in American literature. Read it! I know you'll enjoy it, too.
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【单选题】下列关于胎儿血液循环的描述,哪项正确(    )
A.
脐动脉血含氧浓度比脐静脉高
B.
脐动脉血小部分经动脉导管流入主动脉
C.
上腔静脉血大部分经卵圆孔流入左心房
D.
左心室的血液流人动脉导管
E.
脐动脉在胎儿出生后闭锁形成腹下韧带
【单选题】关于脐带血管的描述下列哪项正确
A.
一条静脉一条动脉
B.
一条静脉两条动脉
C.
两条静脉一条动脉
D.
两条静脉两条动脉
E.
两条静脉三条动脉
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【多选题】抑癌基因Rb具有下列哪些特点?(    )
A.
是最早发现的肿瘤抑制基因
B.
能抑制细胞增殖
C.
Rb基因对肿瘤的抑制作用与转录因子E 2 F有关
D.
位于人13号染色体
【单选题】关于脐带血管的描述下列哪项正确
A.
一条静脉一条动脉
B.
一条静脉两条动脉
C.
两条静脉一条动脉
D.
两条静脉两条动脉
【单选题】链传动设计中,一般链轮最多齿数限制为zmax=120,是为了_____ 。
A.
减小链传动的不均匀性
B.
限制传动比
C.
减少链轮磨损后链从链轮上脱落下来的可能性
D.
保证链轮轮齿的强度
【单选题】链传动设计中,一般链轮最多齿数限制为Zmax=120,这是为了()。
A.
减少链传动的不均匀性
B.
限制传动比
C.
减少链节磨损后链从链轮上脱落下来的可能性
D.
保证链轮轮齿的强度
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A.
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B.
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C.
多细胞来源
D.
作用特异
E.
MHC 限制性
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A.
正确
B.
错误
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