跨经度最广的大洋是[ ]
A．太平洋
B．大西洋
D．印度洋
D．北冰洋
答案：D
_____ his ability of speech, he has made use of each chance.
A．To improve
B．Improving
C．Being improved
D．Improved
下列哪种疾病不引起血小板减少
A．肝硬化B．再生障碍性贫血C．DICD．急性白血病E．急性感染
