— _____
— Go up this road to the end.
A：Where are we now?
B：What are we doing at the supermarket?
C：How can I get to the supermarket?
D：Who can get to the supermarket?
硝化细菌利用的能源是（ ）
知己知彼____ 运筹帷幄____ 出其不意____
围魏救赵____ 四面楚歌____ 草木皆兵____
