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【单选题】
动物细胞在体外培养条件下生长情况是A.
能无限增殖
B.
不能增殖分裂而很快死亡
C.
经过有限次数分裂后最终都要死亡
D.
一般进行有限次数分裂后死亡，少数细胞发生了遗传突变获得了无限增殖的能力
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【单选题】After five hours' drive, they reached they thought was the place they had been dreaming of
A.
that
B.
what
C.
which
D.
where
【单选题】After sailing for five months, they arrived at they thought was the place they had been looking for.
A.
what
B.
that
C.
which
D.
where
【单选题】After five hours’ drive, they reached ____ they thought was the place they had been dreaming of.
A.
what
B.
that
C.
which
D.
where
【简答题】A．Because they thought he was still in China. B．Because they thought be was put into prison. C．Because they thought he was working for the Chinese government. D．Because they thought he was dead.
【简答题】A．They thought the other must have brought the food. B．They are not hungry. C．They forgot to bring the food. D．They like to eat at restaurant.
【单选题】下列关于主关键字字段的叙述中，错误的是( )。
A.
数据库中每个表都必须有一个主关键字字段
B.
主关键字字段值是唯一的
C.
主关键字字段可以是一个字段，也可以是一组字段
D.
主关键字字段中不许有重复值和空值
【单选题】设二叉排序树中关键字由1~1 000的整数构成，现要查找关键字为363的结点，下列关键字序列不可能是在二叉排序树上查找到的序列是( )。
A.
2，252，401，398，330，344，397，363
B.
924，220，911，244，898，258，362，363
C.
925，202，911，240，912，245，363
D.
2，399，387，219，266，382，381，278，363
【单选题】After five hours' drive, they reached _____ they thought was the best place they they'd been dreaming of. [ ]
A.
that
B.
where
C.
which
D.
what
【简答题】C#中是否有下列关键字?
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