在数据库系统中，与恢复有关的是 (46) ；与并发性有关的是 (47) ；与完整性有

静态指标主要包括系统响应时间和系统稳定时间。

大运河（下图）保护和申遗（申报世界文化遗产）工作会议于2012年3月29日在江苏开幕。会议指出：目前，大运河申遗已进入关键阶段，国家文物局也将其作为近期中心任务。这里的大运河

A．以天津市为最北端

B．与隋朝大运河完全相同

C．在唐朝时开凿贯通

D．是古代世界最长的运河

下图为人体的染色体图，观察后完成下列问题：

（1）A人的性别是_____，依据是______________。B人的性别是______，依据是__________________。

（2）在女性的卵细胞中和男性的精子中各含有____条染色体。男性有___种精子，女性有___种卵细胞。

（3）人体的体细胞内含有_____对染色体，并且每一对染色体都是一条来自_____，一条来自_____。

（4）对先天愚型患者进行染色体检查，可以看到患者细胞中染色体数是____条。

（5）若甲乙是一对夫妇，他们生一个男孩的几率是多大？________。

Researchers are placing robotic dogs (机器狗) in the homes of lonely old people to determine whether they can improve the quality of life for humans. Alan Beck, an expert in human-animal relationship, and Nancy Edwards, a professor of nursing, are leading the animal-assisted study concerning the influence of robotic dogs on old people’s depression, physical activity, and life satisfaction. “No one will argue that an older person is better off being more active, challenged, or stimulated (刺激) ,” Edwards points out. “The problem is how we promote(使……成为现实)that, especially for those without friends or help. A robotic dog could be a solution.”

In the study, the robot, called AIBO, is placed for six weeks in the houses of some old people who live alone. Before placing AIBO in the home, researchers will collect baseline data for six weeks. These old people will keep a diary to note their feelings and activity before and after AIBO. Then, the researchers will review the data to determine if it has inspired any changes in the life of its owner.

“I talk to him all the time, and he responds to my voice,” says a seventy-year-old lady.“When I’m watching TV, he’ll stay in my arms until he wants down. He has a mind of his own.”

The AIBOs respond to certain orders. The researchers say they have some advantages over live dogs, especially for old people. Often the elderly are disabled and cannot care for an animal by walking it or playing with it. A robotic dog removes exercise and feeding concerns.

“At the beginning, it was believed that no one would relate to the robotic dog, because it was metal and not furry,” Beck says. “But it’s amazing how quickly we have given up that belief.

“Hopefully, down the road, these robotic pets could become a more-valuable health helper. They will record their masters’ blood pressure, oxygen levels, or heart rhythms. AIBOs may even one day have games that can help stimulate older people’s minds.”

48. The purpose of Beck and Edwards’ study is to ______

A. understand human-animal relationship       B. make lonely old people’s life better

C. find the causes of old people’s loneliness    D. promote the animal-assisted research

49. In the research, the old people are asked to ______

A. note the activities of AIBOs                      B. keep AIBOs at home for 12 weeks

C. record their feelings and activity               D. analyze the collected information

50. What is the advantage of AIBO over live dogs?

A. It is easier to keep at home.                      B. It can help the disabled people.

C. It responds to all the human orders.           D. It can watch TV with its owner.

51. The author seems to suggest that the future robotic dogs may ______

A. cure certain diseases                                B. keep old people active

C. change people’s beliefs                             D. look more like real dogs

党的十九大报告指出，（）是发展的根本目的。

A.增进民生福祉

B.增进民生福利

C.增加民众收入

D.维护民众利益