Before the war broke out, many people________possessions they could not take with them in safe places. A. threw away B. put away C. gave away D. carried away 答案:B某同学在琼脂培养基上接种了A、B两种细菌进行培养,同时,他还在培养基上放了盐水浸过的纸片。经过恒温培养一天后,盐纸片周围只有A细菌生长。这个实验结果表明A、B两种细菌对环境的适应能力有区别, 细菌能够在盐水环境中生存,而 细菌不能在盐水环境中生存。这说明不同细菌需要的 不同。