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单选题
One problem of using pig organs on humans is ______.
A
the size of the pig organs.
B
the quick rejection of the transplant by human bodies.
C
the speed of their maturity.
D
the technical complexity of the operational process.
参考答案
参考解析
解析：
细节理解题。根据题干信息定位到第二段第三句“The problem is，once the donor organ is stitched in place．the body rebels，rejecting it…”，由此可知，猪的器官植入人体后，人体很快就会起排异反应，reject“排斥”，故答案为B项。
细节理解题。根据题干信息定位到第二段第三句“The problem is，once the donor organ is stitched in place．the body rebels，rejecting it…”，由此可知，猪的器官植入人体后，人体很快就会起排异反应，reject“排斥”，故答案为B项。
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profoundly from computers,buildings, or automobiles, where repeated elements
abound.
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complex than most things people build; they have very large numbers of states.
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orders of magnitude more （72 ）than computers do.
Likewise, a scaling-up of a software entity
is not merely a repetition of the same elements in larger size; it is necessarily an increase in
the number of different elements. In most cases, the elements interact with
each other in some（ 73 ）fashion,and
the complexity of the whole increases much more than linearly.
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an accidental one. Hence descriptions of a software entity that abstract away
its complexity often abstract away its essence.Mathematics and the physical
sciences made great strides for three centuries by constructing simplified
models of complex phenomena, deriving properties from the models, and verifying
those properties experimentally. This worked because the complexities（75 ）in the models
were not the essential properties of the phenomena. It does not work when the
complexities are the essence.
Many of the classical problems of
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size. Not only technical problems but management problems as well come from the complexity.A.states
B.parts
C.conditions
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