There is no _________ that the Chinese people will present to the world a successful, splendid and unforgettable exposition（博览会）.

A．belief

B．doubt

C．possibility

D．need

对胸腔积液患者，胸穿抽出有臭味浑浊液体，此时应对胸液做何检查以明了病因（）

A.需氧菌和真菌培养

B.涂片革兰染色和抗酸染色检菌

C.找寄生虫卵

D.查瘤细胞

E.厌氧菌培养