15.Taking a math test can be pretty stressful.Even if you know the material,you can still get the problem wrong.(36)D Therefore you'll improve your grades,as well as your math skills.
Write it out
You can also check a math problem by writing everything out on paper.(37)G Writing out math problems reduces your chances of missing anything to the lowest possible level,which is a common cause of incorrect answers.
(38)A
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 (減法)-to determine whether your answer is the correct one.
Plug in(代入)
You may find that a variable isn't good enough or have a problem where you have to solve for a variable. (39)C This is the only real way to assure yourself that the answer you've found is correct.(40)F
If the result of a problem seems to make no sense,it indicates that the answer is incorrect.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 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.Plug the variable in the equation (方程) to check it out.
D.Knowing how to go through your math test and checking your work can save you from handing in a test full of mistakes.
E.It also helps you to figure out everything after you have already finished the test.
F.Check for a reasonable answer
G.This helps you to know what information you have and what information you need to solve.

分析 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了如何解數(shù)學(xué)題及怎樣驗證答案

解答 36.D.考查考生對上下文因果關(guān)系的理解能力及段落主旨的概括能力.根據(jù)上句"Taking a math test can be pretty stressful.Even if you know the material,you can still get the problem wrong."可知,知道如何通過你的數(shù)學(xué)測試,檢查你的工作可以防止你交出一個充滿錯誤的測試.故選D
37.G.考查考生對上下文順承關(guān)系的理解能力.根據(jù)上文"You can also check a math problem by writing everything out on paper."及學(xué)生解數(shù)學(xué)題的常識性經(jīng)驗可知"把所有的已知條件都列出后,你就會知道該如何解題".故選G.
38.A.考查考生對標(biāo)題的提煉能力.從后面的句子:Make sure your answers work by doing the opposite procedure of what your problem calls for,說明我們可以反過來做題目.選A.
39.C.考查考生對上下文順承關(guān)系的理解能力.從前面的句子:You may find that a variable isn't good enough or have a problem where you have to solve for a variable (變量).可知是在方程式中帶入變量來檢查.選C.
40.F.考查考生對段落主題句的概括理解能力.根據(jù)后文If the result of a problem seems to make no sense,it indicates that the answer is incorrect可知要"檢查答案的合理性;故選F.

點評 七選五閱讀是完成性閱讀,和完形填空很類似,不同的是一個選詞,一個選句子.解題時,要注意上下文語境,充分考慮信息詞(選項中和空格前后句子中相同或相近的詞),選出最符合語境的句子.

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