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【单选题】
按流体的流动状态可将流体流动分类为______。A.
理想流体的流动和实际流体的流动
B.
均匀流动和非均匀流动
C.
层流流动和紊流流动
D.
流动和非流动
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举一反三
【单选题】We can infer from the fourth paragraph that______.
A.
enhancement evolution is technically impossible
B.
parents have the final say on children's genome change
C.
parents and children usually have different designs for the future
D.
enhancement evolution may cause moral problems
【单选题】The tone of the author of the passage in describing theories of co-evolution can best be described as one of
A.
appreciation of the theory's ability to explain the disappearance of certain carbohydrate-rich plant species
B.
admiration for the theory's refutation of the seed-disbursal theory of the disappearance of the carbohydrate-rich plant species
C.
skepticism toward the theory's ability to account for the evolution of trade relations between agriculturalists and foragers
D.
annoyance at the theory's failure to account for such phenomenon as the success of the sago palm
E.
concern that the theory may be insufficient to discredit the Headland Hypothesis
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