数码录音笔是数字录音器的一种，造型如笔型，携带方便．在录音时，声音使话筒中产生随声音而变化的音频电流，音频电流经放大电路放大后，转变为模拟信号，再通过对模拟信号的采样、编码将模拟信号通过数模转换器转换为数字信号，并进行一定的压缩后进行存储，图中能反映声音录入原理的是（　　）

操场跑道弯道部分是半圆，半径是36米，每条跑道宽1.2米，进行200米赛跑时，第4道与第1道的起跑线相差（   ）米

    Welcome to Central Manchester high school（CMHS）

    CMHS has much more than you expect. We have a car park for both our visitors and our students who drive. We have 50 classrooms for different lessons, and a library with over 18,000 books. ⑴Twelve science labs are available for different experiments. Whether students want to exercise or just want some fun, they can use our gym. ⑵室内游泳池全年开放 for students who like swimming.

    Students who live far away from home will be happy with our dormitories. ⑶Each room comes with its own bathroom and Internet access. We have modem medical and experienced nurses. ⑷We make sure that we take good care of students on campus.

    School meals are delicious. Each day our canteen serves meals, and hamburgers and soft drinks are also available during break, tunes.

    ⑸我们希望你在 CMHS 享受你的生活. If you have any Questions or need any help, you can call the Students' Office any time during weekdays and on Saturday mornings.

The Student's Office

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文盲原指不识字的人。现代社会，不会外语、计算机的人，不能与人很好相处、不能与环境协调一致、情感缺乏的人，都可能成为21世纪的“文盲”，这告诉我们（    ）​