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【单选题】
克隆羊“多莉”的诞生,验证了下列哪种说法A.
分化细胞可发生去分化
B.
已分化细胞可发生转分化
C.
终末分化体细胞核的全能性
D.
细胞分化的稳定性
E.
细胞分化的可逆性
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举一反三
【单选题】Before he fell into the river, he took hold of a small tree on the bank by______.
A.
inspiration
B.
instance
C.
instinct
D.
instruction
【单选题】Which of the following statements about Matthew Brady is correct?
A.
He took pictures of American Independence War.
B.
He invented self-developing film.
C.
He was a very famous American scientist.
D.
He made portrait poses very popular.
【简答题】A.He took a tour of the city. B.He read about it. C.He wrote an article about it. D.He worked there as a guide.
【单选题】某工程程包括A、B、C、D、E、F、G、H、I 9个作业，各个作业的紧前作业、所需时间、所需人数如表1-1所示(假设每个人均能承担各个作业)。 该工程的计算工期为(59)月。按此工期，整个工程至少需要(60)人。
A.
9
B.
10
C.
11
D.
12
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