Because the shop _______, the T-shirts are sold at half price.

A．has closed down

B．closed down

C．is closing down

D．had closed down

血淋与尿血的鉴别要点，在于（）

A.属虚属实

B.在表在里

C.属寒属热

D.尿痛与不痛

E.血在尿前尿后