感觉这道题很难

time_older

    

E is the best answer.

    

The second and third paragraphs of the passage indicate that
morphogenetic determinants are

    

substances in the embryo that are activated after the egg has
been fertilized and that “tell a cell

    

what to become” (lines 21-23). If, as the author asserts in the
first paragraph, biologists have

    

succeeded in dividing an embryo into two parts, each of which
survives and develops into a

    

normal embryo, it can be concluded that the quantity of
morphogenetic determinants in the early

    

embryo is greater than that required for the development of a
single individual.

og第五篇第一题

    

25. It can be inferred from the passage that the
morphogenetic determinants present in the early embryo are

    

(A) 
located in the nucleus of the embryo cells

    

(B)  
evenly distributed unless the embryo is not developing
normally

    

(C)  
inactive until the embryo cells become irreversibly
committed to their final function

    

(D) 
identical to those that were already present in the
unfertilized egg（E）

    

(E)  
present in larger quantities than is necessary for the
development of a single individual

        

E is the best answer.

        

The second and third paragraphs of the passage indicate that
morphogenetic determinants are

        

substances in the embryo that are activated after the egg has
been fertilized and that “tell a cell

        

what to become” (lines 21-23). If, as the author asserts in the
first paragraph, biologists have

        

succeeded in dividing an embryo into two parts, each of which
survives and develops into a

        

normal embryo, it can be concluded that the quantity of
morphogenetic determinants in the early

        

embryo is greater than that required for the development of a
single individual.

    

        

E is the best answer.

        

The second and third paragraphs of the passage indicate that
morphogenetic determinants are

        

substances in the embryo that are activated after the egg has
been fertilized and that “tell a cell

        

what to become” (lines 21-23). If, as the author asserts in the
first paragraph, biologists have

        

succeeded in dividing an embryo into two parts, each of which
survives and develops into a

        

normal embryo, it can be concluded that the quantity of
morphogenetic determinants in the early

        

embryo is greater than that required for the development of a
single individual.

    

        

E is the best answer.

        

The second and third paragraphs of the passage indicate that
morphogenetic determinants are

        

substances in the embryo that are activated after the egg has
been fertilized and that “tell a cell

        

what to become” (lines 21-23). If, as the author asserts in the
first paragraph, biologists have

        

succeeded in dividing an embryo into two parts, each of which
survives and develops into a

        

normal embryo, it can be concluded that the quantity of
morphogenetic determinants in the early

        

embryo is greater than that required for the development of a
single individual.

选a,这个inference真是很大胆，原文中没怎么提morphogenetic determinants的数量问题，我在实战重要是碰到这种题，肯定也不敢选。