某同学观察实验室内两个单摆甲和乙的振动，发现单摆甲每完成4次全振动，单摆乙就完成

—Joe, can you answer the phone for me, please? I             supper.

—OK, Mum. [ ]

A. was cooking

B. cook

C. am cooking

D. cooked

据统计某省以往病毒性肝炎发病率维持在0.13%左右，1998年其病的发病率达到0.5%，这种情况属于（）

A.散发

B.暴发

C.隐性流行

D.流行

E.大流行

There are many page replacement algorithms in page management. The most frequently used algorithm is( ).

A．FIFO

B．LRU

C．OPT

D．PPT

Directions:

You are planning to study in a foreign university. Write a letter of application to ask for some materials. Write to tell them

1) your educational background and

2) what major you want to study.

You should write about 100 words on ANSWER SHEET. Do not sign your own name at the end of the letter. Use "Li Ming" instead. You don’t have to write the address.

某物业服务企业200名员工的工资分组资料如下：

工资/(元/月)	1000～2000	2000～3000	3000～4000	4000～5000	5000～6000	合计
员工数/人	30	40	80	30	20	200

则员工工资众数为( )。

A．1000～2000
B．2000～3000
C．3000～4000 D．4000～5000