题型:名词解释 It is clear to us that the 2012 Olympic Games _____ in London will once more draw people's attention in the world to them. [ ]A. having been held B. to hold C. to be heldD. held 查看答案
题型:名词解释 关于弓形虫病的流行病学方面,以下不正确的是()A.猫等哺乳动物是主要的传染源B.先天性感染只有在孕母发生原虫血症时才能传染给胎儿C.后天感染主要是动物与人开放性伤口接触传染D.人类对弓形虫普遍易感E.艾滋病患者常并发弓形虫病 查看答案