李某的丈夫今年因车祸突然去世，儿子2岁，平时李某上班时孩子无人照看。社会工作者小申协调李某所在社区的家政服务机构，解决了李某儿子的照管问题。小申提供的这项服务体现社会工作（ ）的目标。

A．解除危难

B．缓解困难

C．促进发展

D．促进公正

For each blank, choose the best answer from the four choices and write down on the answer sheet.

It is claimed that Al applications have moved from laboratories to the real world. However, conventional von Neumann computers are (66) for Al applications, because they are de- signed mainly for numerical processing. In a larger yon Neumann computer, there is a larger ratio of memory to processing power and consequently it is even less efficient. This (67) remains no matter how fast we make the processor because the length of the computation becomes dominated by the time required to move data between (68) and memory. This is called the yon Neumann (69) . The bigger we build the machines, the worse it gets. The way to solve the problem is to diverse from the traditional architectures and to design special ones for Al applications. In the research of future Al architectures, we can take advantages of many (70) or currently emerging concepts. in computer architecture, such as dataflow computation, stack machines, tagging, pipelining, systolic array, multiprocessing, distributed processing, database machines, and inference machines.

（69）是（）

A.problem

B.question

C.way

D.bottleneck