--- She’s already been back to Wuxi, ________?

--- ________. She is on a visit to Shanghai.

A．isn’t she; No

B．hasn’t she; Yes

C．isn’t she; Yes

D．hasn’t she; No

实验室内只宜存放少量短期内需用的药品，易燃易爆试剂应放在铁柜中，柜的顶部要有通风口。( )