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【单选题】
下列有关细胞分化的叙述正确的是 ( )A.
细胞分化只发生在高等的动物中
B.
细胞分化只发生在胚胎发育期
C.
分化的细胞会呈现出在形态、结构、功能、遗传物质上的差异
D.
经过细胞分化会形成各种不同的细胞和组织
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【单选题】How many problems are there ____? [ ]
A.
work out
B.
to be worked out
C.
to work them out
D.
working out
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【单选题】______large number of people are out of work now and______ number of people out of work is still growing up.
A.
The; a
B.
A; a
C.
The; the
D.
A; the
【单选题】A photon in light beam A has twice the energy of a photon in light beam B. The ratio pA/pB of their momenta is:
A.
1
B.
1/2
C.
2
D.
4
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