The climate change conference has come to __________ end, but the developing countries are dissatisfied with __________ small step that the developed countries have taken to reduce the emission(排放) of water gases.

A．不填， a

B．不填， the

C．an , a

D．an, the

扁桃体的血液供应来自（）

A.腭升动脉

B.腭降动脉

C.面动脉扁桃体支

D.咽升动脉扁桃体支

E.舌背动脉