第2题: [单项选择]The population which is top-heavy with older people poses a problem to __________. A. the government B. the economy C. the workforce D. all of the above 参考答案:D 答案解析:[解析]由末段可知 older people 过分增加，会给三方面造成影响：the government，the economy 以及 the workforce。
第20题: [单项选择]GMPLS is based upon：（） A. Packet-based switching devices B. VPI/VCI-based switching devices C. Non-Packet-based devices D. None of the above E. A and B 参考答案:C
A. increase the production of literature B. use poetry to relieve modern stress C. develop new modes of expression D. apply more adjectives and verbs 参考答案:C 答案解析:[解析] 事实细节题。文章第三段说This speeding up of life，says the futurist，requires a new form of expression，可见未来主义
