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【简答题】
上皮组织的主要特点是细胞排列（），细胞形状规则，细胞间质极少，上皮内无血管和（）。
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举一反三
【单选题】The author says that he is a naturalist rather than a scientist probably because he thinks he ______. ( )
A.
has a great deal of trouble doing mental arithmetic
B.
lacks some of the qualities required of a scientist
C.
just reads about other people's observations and discoveries
D.
comes up with solutions in a most natural way
【单选题】In Hongkong, money supply is a market-determined phenomenon rather than a Monetary Authority regulated one.
A.
正确
B.
错误
【单选题】Which of the following is a supposition rather than a fact concerning the queen in a naked mole rat colony? ______
A.
She exerts chemical control over the colony.
B.
She is the largest member of the colony.
C.
She mates with more than one male.
D.
She is the only breeding female.
【单选题】The author says that he is a naturalist rather than a scientist probably because he thinks he______.
A.
just reads about other people's observations and discoveries
B.
comes up with solutions in most natural ways
C.
has a great deal of trouble doing mental arithmetic
D.
lacks some of the qualities required of scientist
【简答题】下图表示利用胚胎干细胞(ES细胞)所作的一系列研究，请据图分析回答： (1)过程Ⅰ将胚胎干细胞置于γ射线灭活的鼠胎儿成纤维细胞的饲养层上，并加入动物血清、抗生素等物质，维持细胞不分化的状态。在此过程中，饲养层提供干细胞增殖所需的__________，加入抗生素是为了__________，这对于研究细胞分化和细胞凋亡的机理具有重要意义。 (2)过程Ⅱ将带有遗传标记的ES细胞注入早期胚胎的囊胚腔，通过...
【单选题】The author says that he is a naturalist rather than a scientist probably because he thinks he ______.
A.
has a great deal of trouble doing mental arithmetic
B.
comes up with solutions in a most natural way
C.
lacks some of the qualities required of a scientist
D.
just reads about other people’s observations and discoveries
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