—Don't ____our hopes. Things will be fine soon.

—Yes.We should learn to be brave when we are in difficulties. [ ]

A.cheer up

B.give up

C.clean up

D.give in

某电器公司经销一种家用电器，销售单价为1500元/台，单位商品变动成本为1200元/台，固定成本分摊为6万元。该家用电器的保本销售额是( )万元。

A．28

B．29

C．30

D．31