发酵工程的主要内容包括（）、发酵条件的优化与控制、（）、提取与精制。
参考答案：生产菌种的选育；反应器的设计及产物的分离
The garden _______ while they were away from here. [ ]
A. took good care of
B. was taken good care
C. was taken good care of
D. was taking good care
个人经营贷款可采用抵押、质押、保证担保方式。（）
