若直线y=2x+1向下平移n个单位后，所得的直线在y轴上的截距是-2，则n的值是（　　）

A．1

B．2

C．3

D．4

短文改错（共10小题，每小题1分，满分10分）注意答题规范

Many people find exams frightened experiences. Sit down for an exam when

everyone is so quiet and serious really makes people nervous. In order to overcome

that, I always do few things to relax after I start. At the beginning of the exam, I

read out all the directions carefully so that I can know exactly how I have to do.

Then I work out how many time I can spend on each question and make sure I keep

to my timetable. If I feel myself getting nervous at any time, I will stop what I was

doing and take a few deep breath. However, I think the most important thing is to

review my work thoroughly before exams. The better I’m prepared, the more

worried I will be in exams.