腱反射是()A.外感受性反射 B.行为反射 C.单突触反射 D.紧张性牵张反射 E. 发布时间:2017-07-09 22:32 │ 来源:www.tikuol.com 题型:单项选择题 问题: 腱反射是()A.外感受性反射B.行为反射C.单突触反射D.紧张性牵张反射E.腱器官引起的反射
题型:单项选择题 科学家利用转基因技术,将某种细菌的抗病毒基因导入到正常玉米植株中,培育出了抗病毒玉米.这种玉米之所以能够抗病毒,是因为其获得了( )A.玉米的抗病毒性状B.玉米的抗病毒基因C.病毒的抗病毒性状D.细菌的抗病毒基因 查看答案
题型:单项选择题 When my parents were young, they had to ________ several miles every day to school since they had no money to buy a bike.[ ]A.occupyB.coverC.getD.make 查看答案