下列胸部损伤后，需要用厚棉垫加压包扎的是（）

A.张力性气胸

B.开放性气胸

C.连枷胸

D.血气胸

E.闭合性气胸

U.S. President Barack Obama ______ a speech at a dialogue with Chinese youth at the Shanghai Science and Technology Museum during his four-day state visit to China, Nov. 16, 2009.

A．addressed

B．delivered

C．composed

D．recited