生命表是根据以往一定时期内各种年龄死亡统计资料编制的一种统计表。生命表中最重要的内容就是（）。

A.每个年龄的出生率

B.每个年龄的出生和死亡率

C.每个年龄的健康状况

D.每个年龄的死亡率

Directions:

Suppose you are the secretary of the principal of your university. You are expected to write a memo to remind the principal of an important international meeting he has to attend the next day. Imagine some detailed activities the principal has to perform in the meeting.

Write your memo in no less than 100 words. Write it neatly on ANSWER SHEET 2.

Do not sign your own name on the memo; use Li Hua instead.

Do not write the address. (10 points)