单项选择题
60what does Dr. Ross Cartmill mean by “the ostrich approach”(line q par a casual attitude towards one’s health conditionsB. a new therapy for certain psychological problemsC. refusal to get medical treatment for fear of the pain involvedD. unwillingness to find out about one’s disease because of fear
多项选择题 下列哪些特性使端粒酶不同于其他的DNA聚合酶？（）
单项选择题 76.A. before B. while C. until D. when
多项选择题 下列哪些物质可以通过核孔？（）
