短语翻译。1. 回答他的问题 ________________________

Beibei, ________ back to the Song Dynasty, was once again made top in a list of “the cleanest districts (区域) of Chongqing” recently.

A．dated

B．dates

C．dating

D．had dated

It's ten years since the scientist     _ on his life's work of discovering the valuable chemical.     [ ]

A. made for                    

B. set out      

C. took off                    

D. turned up

在救援和撤离人员时，必须先按下（）。

（）一般是以班级的形式进行，它是根据年龄或文化程度把学生编成有固定人数的班级，由教师按照教学计划统一规定的内容和时数进行教学的教学组织形式。

A.集体授课

B.个别化教学

C.小组教学

D.团队学习

Bill Jones is creating a charitable trust to provide six annual payments of $ 20000 each, beginning next year. How much must Jones set aside now at 10 percent interest compounded annually to meet the required disbursements（）

A. $ 95815.74.

B. $ 87105.21.

C. $169743.42.