A.Nature has equal influence compared with human beings. B.Nature has less influence than human beings. C.Nature has more influence than human beings. D.Nature doesn't have influence on the whole.
【简答题】The problem of poverty in the United States is ( ) because of the long-term social and economic inequality, stagnant wages and lack of public assistance program, and unreasonable policy.
【单选题】In animal experiments, a 20 cm long tube was connected to the side tube of the endotracheal intubation in rats . The main reason for the change in respiratory activity because of the long tube breathi...