腰椎间盘突出症是指A．软骨板松动 B．纤维环破裂 C．后纵韧带断裂 D．前纵韧带断裂

Which of the following statements about unemployment is least accurate（）

A. Frictional unemployment is unemployment due to changes in the economy that prevent qualified workers from being immediately matched with existing job openings.

B. The economy is said to be operating at full employment only if there is no cyclical or frictional unemployment in the economy.

C. The economy is said to be operating at full employment when cyclical unemployment is zero.

今年3月9日中央电视台报道，欧洲科学家最近发现了一种新的大气污染源--亚硝酸（HNO₂）气体．此气体将导致城市上空产生有害烟雾．HNO₂中氮元素的化合价是______，亚硝酸根离子的符号是______．

病历摘要：女，23岁，第一胎，孕31周，外伤后突然剧烈腹痛，少量 * * 流血，急诊送入院。查：血压10.0/8.0kPa（75/60mmHg），脉搏120次／分钟，面色苍白，大汗淋漓，下肢水肿，宫底剑突下三横指，胎位不清，胎心听不到，宫体左前壁轻压痛。

大出血需要行颈外静脉穿刺，其错误部位是（）

A.上颌角和锁骨下缘中点连线1/2处，颈外静脉外缘

B.下颌角和锁骨上缘中点连线上1/3处

C.下颌角和锁骨下缘中点连线1/3处

D.下颌角和锁骨上缘中点连线1/2处

E.下颌角和锁骨下缘中点连线下1/3处

My daughter comes home from school and then spends an hour on the phone talking

to the very people she has been at school _____ all day.

A．for

B．on

C．不填

D．with

在经济学上，人口红利是指随着劳动人口在总人口中的比例上升，所带来的经济成长效应。据测算，2010年至2020年我国劳动人口将减少2900多万人，由此产生的结果可能有（）

①我国企业的劳动力成本上升

②中国产品国际竞争力增强

③劳动者不再需要竞争就业

④推进经济结构战略性调整

A.①③

B.①④

C.②③

D.②④