The preschool movement can be traced back as far as the 4th century B.C. When Plato stressed the importance of early childhood, and the necessity of family co-operation. A study of ancient history reveals that some of the early philosophers, preachers(布道师) and educational reformers considered the significance of parent-child relationships, and made plans for improved education for infants and young children. However, it is in the 17th century that early child hood education as we know it received its impetus(推进).
In the history of education, several educational leaders have made valuable early contributions to the preschool movement. The pioneer work of Comenius, Rousseau, Basedow, Pestalozzi and Froebel in this field is particularly noteworthy. More recently, important additions were made by Montessori, Dewey, and others. Early in the 20th century, organized planning for preschool training led to the introduction of institutions designed specially for this purpose. In En
A. the forerunner of the preschool movement
B. a philosopher supporting a study of ancient history
C. a teacher insisting significance of education for parents
D. able to establish his school
When they first arrived in Europe over 500 years ago, the Roma were called Gypsies in the mistaken belief that they had come from Egypt. The true origins of the Roma remained a mystery until the late 18th century, when European linguists discovered connections between the Romani language and certain dialects spoken in northwestern India.
The world population of Roma is difficult to establish with any certainty. Estimates suggest that there are approximately 12 million Roma worldwide. About 8 million Roma live in Europe, and they make up that continent’s largest minority population. The Roma are divided into groups sometimes referred to as nations or tribes. These divisions generally reflect historical patterns, of settlement in different geographic areas. Although historically looked at as wanderers, the vast majority of modern Roma live in settled communities.
Because the Roma are widely settled, their culture and social organization vary considerably. An i
A. Population and distribution.
B. Population and division.
C. Population and living.
D. Population and tribes.
下面是关于某测试设备的叙述，仔细阅读并分析，回答问题1至问题4，将答案填入对应栏内。
【说明】
某测试设备是一个嵌入式系统，是为了测试一个专用设备而研制的，如下图所示。测试设备用于测试被测设备的各项软、硬件功能，包括2路RS232串口、2路模拟量、电源以及专用设备的其他内部部件。在被测专用设备内部有专门的自检测程序，来测试内部各部件。测试设备的串口与被测设备相连接，加电后，通过按测试设备的周边键与被测设备握手同步，再向被测设备发送检测消息，被测设备测试自己的某项功能后，通过串口将测试结果发回给测试设备，显示在测试设备的LCD屏上。
测试设备的硬件由处理器模块、IO模块和电源模块组成，处理器模块上有CPU、存储器、2路串口、键盘控制器；IO模块上有D/A、A/D转换器，用作为模拟量输入和采集电源的电压值，以测试被测设备的模拟量和电源；电源模块提供测试设备的电源；测试设备模块间采用ISA总线。
测试设备的2路串口与被测设备相连，同时测试设备的D/A、A/D转换控制器的输入线路与被测设备的模拟量和电源线相连，可直接测试被测设备的2路RS232串口、2路模拟量、电源。
测试设备的软件由底层驱动(串口驱动、D/A、A/D驱动和自定义键盘驱动)、嵌入式操作系统和测试软件组成。
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