Question

Taking a math test can be pretty stressful. Even if you know the material, you can still get the problem wrong. Knowing how to go through your math test and check your work can save you from handing in a test full of mistakes that can be avoided.   小题1: 
Write it out
You can also check a math problem by writing everything out on paper.   小题2:  Writing out math problems reduces your chances of missing anything to the lowest possible level, which is a common cause of incorrect answers.
 小题3: 
Make sure your answers work by doing the opposite procedure of what your problem calls for, including the answer you got the first time around. In other words, you would use the opposite of this addition problem—subtraction (减法)—to determine whether or not your answer is the correct one.
Plugging in
You may find that a variable isn’t good enough or have a problem where you have to solve for a variable (变量).   小题4:  This is the only real way to assure yourself that the answer you’ve found is correct.
Check for a reasonable answer
  小题5:  For example, if you get an answer in the millions and you know it should be in the thousands, you’ve likely misplaced a point. Go back through the work on your paper to make sure all of your formulas (公式) and calculations are correct. If everything looks okay, do the problem again and compare the result of the second try to what you’ve got on the first try.

A．Do the opposite

B．Correct the answers

C．Therefore you’ll improve your grades, as well as your math skills.

D．Plug the variable in the equation (方程) to check it out.

E. If the result of a problem seems to make no sense, it indicates that the answer is incorrect.
F. It also helps you to figure out everything after you have already finished the test.
G. This helps you to know what information you have and what information you need to solve.

Answer 1

小题1:C
小题2:G
小题3:A
小题4:D
小题5:E

试题分析：
小题1:从前面的句子：Knowing how to go through your math test and check your work can save you from handing in a test full of mistakes that can be avoided. 可知要提高成绩和数学技能。选C
小题2:从前面的句子;You can also check a math problem by writing everything out on paper.可知这样做可以让你知道自己有什么信息，需要解决什么信息。选G
小题3:从后面的句子：Make sure your answers work by doing the opposite procedure of what your problem calls for, 说明我们可以反过来做题目。选A
小题4:从前面的句子：You may find that a variable isn’t good enough or have a problem where you have to solve for a variable (变量). 可知是在方程式中带入变量来检查。选D
小题5:从后面的举例：For example, if you get an answer in the millions and you know it should be in the thousands, you’ve likely misplaced a point.可知如果结果没有意义，说明答案有误。选E
点评：这篇文章要求给每个段落找主题句，先浏览各个选项做到心中有数，在阅读时，抓住每个段落的主旨，还要注意关键句。和选项进行一一配对。