Susan knows a lot about Nanjing, she is

— Would you please tell us something about the Group of Eight?

— Well, the G8 is an international organization ______ the richest countries of the world.

A．making up of

B．consisted of

C．consisting of

D．made of

医学科研的根本目的是（）

A.揭示生命活动的本质和规律

B.认识疾病发生、发展过程

C.寻找诊治疾病的有效途径

D.探求增进健康的方法

E.维护和增进人类健康，造福人类

在300，00英尺高度巡航并安静地坐着，有用意识时间大约是（）。