Though our city has a good public transport system, _______ private car is becoming _________ popular means of transport.

A．a; /

B．the; the

C．the; a

D．/; the

急性白血病与慢性白血病最主要的区别是（）

A.病程的长短

B.贫血的程度

C.骨髓白血病细胞所处的阶段

D.出血程度

E.外周血白细胞数目的多少