The author uses the examples of horse and ox to argue that______.
A.humans should not maltreat animals.
B.man wasted a lot of resources in his exploitation of the enviroment.
C.there was no technical improvement areas of human efforts.
D.stagnation which prevailed for a long time was as sterile as it was inhuman.
第6题
混凝土的耐久性包括()。
A.抗渗性、抗冻性、耐磨性、抗碳化性
B.抗渗性、抗侵蚀性、耐磨性
C.抗渗性、抗冻性、抗侵蚀性、耐磨性
D.抗渗性、抗侵蚀性、耐磨性
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