要比较甲乙两地某病的患病率（患病率受性别影响），对性别进行标准化，其标准构成应选择（）

A.甲地的年龄构成

B.乙地的年龄构成

C.甲地和乙地合并的年龄构成

D.甲地和乙地合并的性别构成

E.有代表性、较稳定、较大的人群的年龄构成

Which of the following index represents small-company stocks

Which of the following statements is NOT true of the passage

A．International trade has become an important part of national development.
B．Summit talks will be held to discuss problems in international trade.
C．Developing countries benefit more from international trade than development aid.
D．The Doha Development Agenda has made development its pivotal concern.