下列对入伍宣誓说法正确的是（）。

A.入伍宣誓是新战士对自己肩负的神圣职责和光荣使命的承诺和保证

B.新战士入伍后，必须进行入伍宣誓

C.宣誓时间不得迟于入伍后30日

D.宣誓仪式由新训领导机构组织实施

Questions 15～18

A. It has a population of two million people.
B. Its tourist industry accounts for 8% of its GDP.
C. Most of its residents are of British origin.
D. Most of its income comes from tourism.