下列句子中划线词语使用不恰当的一项是（    ）

生活在线：小刚的一些生活片段
片段一：中学生小刚喜欢利用课余时间在家上网浏览新闻，同时他还积极响应网上“爱心邮包”的号召，在开学初向贫困山区儿童捐赠了自己的闲置衣物及学习用品。但他从不浏览网络上的黄色信息，还主动向有关部门提出治理建议。
片段二：小刚初二时成绩一直不错，但从开学到现在，他的心情逐渐不好起来。因为妈妈和老师总说，九年级是非常重要的一年，应该抓紧时间好好学习，将来在中考时才能考上重点高中。以至于最近的半个多月，小刚每天晚上忙到12点，白天强打精神听课，一到考试就经常出现紧张不安、心烦意乱、失眠等现象，学习成绩每况愈下。小刚痛苦不已，最近经常有大哭一场的冲动，还时常发脾气。

如图甲所示，倾角θ=37°的粗糙斜面固定在水平面上，斜面足够长．一根轻弹簧一端固定在斜面的底端，另一端与质量m=1.0kg的小滑块（可视为质点）接触，滑块与弹簧不相连，弹簧处于压缩状态．当t=0时释放滑块．在0～0.24s时间内，滑块的加速度a随时间t变化的关系如图乙所示．已知弹簧的劲度系数k=2.0×10²N/m，当t=0.14s时，滑块的速度v₁=2.0m/s．g取l0m/s²，sin37°=0.6，cos37°=0.8．弹簧弹性势能的表达式为E_p= $\frac{1}{2}$ kx²（式中k为弹簧的劲度系数，x为弹簧的形变量）．求：

B

    Kate is an English girl. She lives in a tall building in the city of London. There are sixteen floors in the building, and she lives on the tenth floor. She uses a lift(电梯) to go up and down.

    Kate studies in a middle school near her house and she works hard. She goes to school early. Every day she leaves her home at half past six. She walks to the lift, and it takes her down to the first floor.

    There is a bus stop near the building. Usually she takes the No. 7 bus to her school. Classes begin at eight. She goes to play games at three forty. She gets home at a quarter past five. She begins to do her homework at eight and finishes it at half past nine.