下列图形既是轴对称图形，又是中心对称图形的是[ ] A.平行四边形 B.正方形

高倍数泡沫灭火剂的发泡倍数按（）计算。

北京市统计部门发布的最新抽样调查结果的要点，拟一条一句话新闻。(不超过40个字)

1999年第10期《内参信息》发布了北京统计部门最新抽样调查结果：北京市失业人口中，86.8%是40岁以下的青壮年，其中25岁至29岁的失业人口最多，而40岁以上的失业人口较少；失业人口中男性所占比重为58.4%；失业人口中，3人户、4人户、5人及以上户所占比重分别为42.5%、20.4%和20.2%；失业人口中，95.6%的人有求职愿望，但只有3.3%的人正在接受培训，29.7%的人准备参加培训。

治疗胸痹心血瘀阻证的代表方剂是（）

A.生脉饮

B.瓜篓薤白白酒汤

C.血府逐瘀汤

D.瓜蒌薤白半夏汤

E.苏合香丸

员工福利计划在帮助企业实现留住优秀员工方面的作用表现在（）：①良好的福利可以提高员工离开本企业的机会成本；②长期福利项目使员工流动的成本逐年增加；③人性化的福利设计使员工感到温暖，提高员工对企业的忠诚度；④优厚的员工福利可以让员工努力工作，提高企业的生产效率。

A．①②

B．①②③

C．②③

D．①②③④

"In the long run," as John Maynard Keynes observed, "we are all dead. " True. But can the (1) run be elongated in a way that makes the long run (2) And if so, how, and at what cost People have dreamt of (3) since time immemorial. They have sought it since the first alchemist put an elixir of (4) on the same shopping list as a way to turn lead into gold. They have (5) about it in fiction, from Rider Haggard’s "She" to Frank Herbert’s "Dune". And now, with the growth of (6) knowledge that has marked the past few decades, a few researchers believe it might be within (7) .

To think about the question, it is important to understand why organisms-people (8) -age in the first place. People are like machines: they (9) That much is obvious. However, a machine can always be (10) A good mechanic with a stock of spare parts can keep it going (11) . Eventually, no part of the (12) may remain, but it still carries on, like Lincoln’s famous axe that had three new handles and two new blade.

The question, of course, is whether the machine is worth (13) . It is here that people and nature (14) . Or, to put it slightly (15) , two bits of nature disagree with each other. From the individual’s point of view, (16) is an imperative. You cannot reproduce unless you are alive. A fear of death is a sensible evolved response and, since (17) is a sure way of dying, it is no surprise that people want to stop it in its tracks. Moreover, even the appearance of ageing can be (18) . It (19) the range of potential sexual partners who find you attractive-since it is a sign that you are not going to be (20) all that long to help bring up baby-and thus, again, curbs your reproduction.

14（）

A.compromise

B.agree

C.disagree

D.consent