— Mary, let’s go to the lecture by Hawking, which is said to be very interesting.

— I’d like to, but I ________ finish the report first.

A. can                     B. may                  must                      D. shall

贫血时病人皮肤及粘膜苍白，较为可靠的检查部位是

A．面颊、皮肤及上腭粘膜，
B．手背皮肤及口腔粘膜
C．耳轮皮肤
D．颈部皮肤及舌面
E．睑结膜、指甲及口唇