The mountain I visited last Sunday isn’t very ________. Few ________ go sightseeing there.

A．tourist; tourists

B．touristy; tourist

C．touristy; tourists

D．tourist; tourist

跟踪检查通过静脉滴注人体内的某种药物，在心脏中首先发现这种药物的部位是

A．左心房

B．右心房

C．左心室

D．右心室