用如图所示的实验装置，探究弹力和弹簧伸长的关系。实验主要操作步骤如下：先将待测弹簧的一端固定在铁架台上，然后将刻度尺竖直放在弹簧一侧，并使弹簧另一端的指针恰好落在刻度尺上。当弹簧自然下垂时，读取指针指示的刻度数值为L₀；当弹簧下端挂一个100 g的钩码，读取指针指示的刻度数值为L₁；弹簧下端挂两个100 g的钩码，读取指针指示的刻度数值为L₂；……；挂七个100 g的钩码时，读取指针指示的刻度数值为L₇（计算结果保留三位有效数字，g取10 m/s²）。

（1）下表是甲实验小组的数据记录和处理的表格，请你在表中直接填写甲组实验得到的弹簧劲度系数k_甲；

“探究弹力和弹簧伸长的关系”实验数据记录及处理：甲组

（2）乙实验小组换用不同的弹簧做实验，采用图像法处理实验数据；以刻度尺读数L为横坐标，以所挂钩码质量m为纵坐标，所画图像如图所示，根据该图像可知，乙实验小组采用的弹簧的劲度系数k_乙为____N/m。

In the United States, the first day nursery was opened in 1854. Nurseries were established in various areas during the (91) half of the 19th century; most of (92) were charitable. Both in Europe and in the U. S. , the day-nursery movement received great (93) during the First World War, when (94) of manpower caused the industrial employment of unprecedented numbers of women. In some European countries nurseries were established (95) in munitions (军火)plants, under direct government sponsorship. (96) the number of nurseries in the U.S. also rose (97) , this rise was accomplished without government aid of any kind. During the years following the First World War, (98) , Federal, State, and local governments gradually began to exercise a measure of control (99) the day nurseries by (100) them and by inspecting and regulating the conditions within the nurseries.
The (101) of the Second World War was quickly followed by an increase in the number of day nurseries in almost all countries, as women were (102) called upon to replace men in the factories. On this (103) the U. S. government immediately came to the support of the nursery schools, (104) $6,000,000 in July, 1942, for a nursery school program for the children of working mothers. Many States and local communities (105) this Federal aid. By the end of the war, in August, 1945, more than 100,000 children were being cared (106) in day-care centers receiving Federal (107) Soon afterward, the Federal government (108) cut down its expenditures for this purpose and later (109) them, causing a sharp drop in the number of nursery schools in operation. However, the expectation that most employed mothers would leave their (110) at the end of the war was only partly fulfilled.

A．circumstance

B．occasion

C．case

D．situation