患者，女，30岁，胸片示右上纵隔一椭圆形阴影，其中有斑点状钙化影，透视下见块影可随吞

Hippies were members of a youth movement of the 1960’s and 1970’s that started in the United States and spread to Canada, Great Britain, and many other countries. The hippies rejected the customs, traditions, and life styles of society and tried to develop those of their own. Most hippies came from white middle-class families and ranged in age from 15 to 25 years old. They thought too many adults cared about making money and little else. The term hippie may come from the word hip, which means "turned-in" or aware.

Hippies wanted a world based on love of humanity and peace. Many believed that wonderful, magical changes were about to take place. They thought these changes would happen as soon as people learned to express their feelings honestly and to behave naturally at all times. Hippies ply opposed U.S. involvement in the Vietnam War.

Many hippies lived together in small groups, working with one another and sharing possessions. Others refused to be tied down to a fixed job or home. They wandered from place to place seeking part-time work and temporary shelter. Some begged for spare change and lived in the streets or camped in parks or other public lands.

Hippies were sometimes called "flower children" because they gave people flowers to communicate gentleness and love. They let their hair grow long and walked barefoot or in sandals. Hippies attracted public attention by wearing clothing that featured unusual combinations of colors and textures. A large number of hippies used marijuana, LSD, and other drugs. Drug experiences shaped many of their symbols and ideas.

The Beatles, a popular English rock group, helped spread the hippie movement with their song. Hippie favorites included such other rock groups as the Grateful Dead and the Jefferson Airplane, singers Joan Baez and Bob Dylan, poet Allen Ginsberg, and novelist Ken Kesey. Many hippies admired Timothy Leary, a psychologist who preached salvation through the use of drugs.

In time, most hippies realized it was not easy to reform society by "dropping’out" of it. Some joined more organized political movements to work for specific social causes. Others turned to spirituality or religion. The majority simply left the hippie stage of their lives behind while trying to hold on to at least a few of the ideals that once inspired them.

Hippies gave flowers to people because they（）

A. wanted a world based on love of humanity and peace

B. could not find jobs and had to sell flowers for a living

C. wanted to tell people that they were badly in need of love

D. wanted to show people that they meant no harm to them

某化肥厂甲、乙两个车间包装肥料，在自动包装传送带上每隔30分钟抽取一包产品，称其重量，分别记录抽查数据如下：

甲：102，101，99，98，103，98，99

乙：110，115，90，85，75，115，110

（1）这种抽样方法是哪一种？

（2）估计甲、乙两个车间产品的平均数与方差，并说明哪个车间产品较稳定？

关于我国癌症的流行特点，叙述错误的是（）。

A.城乡癌症发病率和死亡率均呈显著上升趋势

B.癌症年龄调整死亡率城市地区呈上升趋势

C.癌症年龄调整死亡率农村地区呈上升趋势

D.发病率上升幅度最大的为肺癌

E.消化道肿瘤发病率居高不下，肺癌、乳腺癌等发病率也在明显上升

流通企业是连接制造业和最终客户的纽带

如果该小区的成交价格从2012年1月起连续2个月出现每月3%的下跌，则至2012年3月，与77号704室相似的住宅的成交总价约为（）。

A．91万元

B．145万元

C．155万元

D．166万元