皮皮学，免费搜题
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【单选题】
据最新研究发现,内皮素在皮肤中分布不均,是造成色斑的主要原因。内皮素拮抗剂进入皮肤,可以和黑色素细胞膜的受体结合,使内皮素失去作用,这为美容研究机构带来了福音。上述材料体现了 ( )A.
细胞膜中蛋白质含量越高,功能越复杂
B.
细胞膜作为系统的边界,严格控制物质进出细胞
C.
细胞膜具有信息交流的功能
D.
细胞膜的组成成分主要为磷脂和蛋白质
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【简答题】Why does
the professor mention teeth?A. As a good source of
Vitamin D B. As an additional example
of bones. C. As a place in the body
where Vitamin D is converted D. As something that does
not get muc...
【单选题】What important point does the professor make about the area where the rocks are found?
A.
It has been the site of Earth's highest wind speeds.
B.
It is subject to laws that restrict experimentation.
C.
It is accessible to heavy machinery.
D.
It is not subject to significant changes in temperature.
【单选题】What does the professor mean where says this:
A.
Results are tragic when airplanes strike birds.
B.
Sightings of birds from aircraft are unusual.
C.
Airplanes do not frighten away most birds.
D.
There is little similarity between birds and jets.
【单选题】Where does professor Kelly Stevens work?
A.
a) Tokyo University
B.
b) the University of Washington
C.
c) Cambridge University
D.
d) Cairo University
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