题目

During the recent milk crisis in China, different related parts of the society have been put under the microscope, including stars. An online survey asked if celebrity spokespersons should bear responsibility for endorsing （代言） tainted milk products．Thirty four percent answered “yes”．They said that the celebrities had betrayed the trust of the people and should be more morally responsible. They are right．But what’s more important is that we should train ourselves to be wise enough not to blindly accept what is being sold, even by our favorite stars. No doubt television adve有性生殖和无性生殖的本质区别是（ ）A．能否由母体产生性个体B．能否进行有丝分裂C．能否形成生殖细胞D．有无两性生殖细胞的结合