题型:选择题 We advised him __________________A.telling not the news to his deskmateB.not tell the news to his deskmateC.not telling the news to his deskmateD.not to tell the news to his deskmate 查看答案
题型:单项选择题 关于正常菌群的叙述,正确的是()。A.一般情况下,正常菌群对人体有益无害B.肠道内的双歧杆菌产生大量碱性物质,能拮抗肠道细菌感染C.口腔中的正常菌群主要为需氧菌,少数为厌氧菌D.即使是健康胎儿,也携带正常菌群E.在人的一生中,正常菌群的种类和数量保持稳定 查看答案