设（正反应为吸热反应），反应速率为v1；正反应为放热反应），反应速率为v2，对于

—Hi, Jack! When did you arrive in Berlin?

—Last weekend .I         a different culture since then.

A．was experiencing

B．will be experiencing

C．have been experiencing

D．had been experiencing

保障会计软件及计算机硬件的正常运行是软件编制人员的责任。( )

Don't eat the food that has gone bad, otherwise you will _____. [ ]

A. fall ill

B. fall silent

C. fall asleep

D. fall in love

表现论