以三角形的一边长为直径的圆切三角形的另一边，则该三角形为 [ ] A．锐角三角形

阅读理解。

     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 lefe 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 riends 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. ASIBOs may even one day have games

that can help stimulate older people's minds."

1. 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

2. 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

3. 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.

4. 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 gods

荷兰人均自行车达到（）辆。

A.0.8

B.0.9

C.1

D.＞1

在中华人民共和国境内从事无公害农产品生产、产地认定、（）、监督管理等活动，适用无公害农产品管理办法

中国移动GSM900的下行频率是（）。

A.890-909MHz

B.870-880MHz

C.935-954MHz

D.954-960MHz

数字式电液调节系统的英文名称为（）。