改革开放以来，我国外交事业取得了一个又一个的伟大成就。新世纪的第一年，在上海举行了一次我国迄今规模最大、规格最高的多边外交活动。这个活动是（  ）

有些人认为，宏观经济增速的放缓，必然导致就业人数减少，就业率也将应声下跌。2014年我国GDP比上年增长7.4%，尽管宏观经济增速略有放缓，但城镇新增就业1 320万人，创历史新高，出现所谓“不对称现象”。你认为出现这一现象的原因是（   ）

①经济增速虽减缓，但社会需求扩大，刺激就业 

②劳动年龄人口比重增加，供过于求，利于就业 

③产业结构优化升级，服务业进一步发展 

④国家实施更加积极的就业政策，强化政策支撑

Gemma Burford

    Gemma was born in' 1978 in a quiet (安静的) village in England. Her mother worked in a library and her father worked in a hospital. When she was a student at Oxford University, she travelled to Tanzania and met her husband, Lesikar for the first time. They got married in 2003 and had their daughter, Lucia, two years later. Now Lucia studies in a small primary school, and Gemma and Lesikar also teach her at home.

"Judy Boehmer

    Adam is Judy's first child. She now has four sons, seven daughters and a pet (宠物) dog, Bosco. Judy and her husband, Larry, live in Atlanta, Georgia, but they also have a motorhome (野营车). The Boehmers are a circus (马戏团) family and all the children are performers (演员) at the circus. The- children don't go to school, but study at home. The family travels more than 40.000 kilometres a year for their work The first show of the Boehmers was at a park in Lowa in 1989, and they now perform all over America.

隋朝是在灭了下列哪个政权后统一中国的（　　）

以下是关于常量和变量的说法：

（1）在一个变化过程中，允许出现多个变量和常量；

（2）变量就是变量，它不可以转化为常量；

（3）变量和常量是相对而言的，在一定条件下可以相互转化；

（4）在一个变化过程中，变量只有2个，常量可以没有，也可能有多个．

其中正确的说法有（　　）