2019年全國英語等級考試三級閱讀理解習(xí)題（6）

　　An alcohol breath test (ABT) is often used by the police to find out whether a person is drunk while driving.In the United States，the legal blood alcohol limit is 0.08% for people aged 21 years or older，while people under 21 are not allowed to drive a car with any level of alcohol in their body.A “positive” test result，a result over the legal limit，allows the police to arrest the driver.However，many people who tested positive on the test have claimed that they only drank a “non­alcoholic” energy drink.Can one of these energy drinks really cause someone to test positive on an ABT?Researchers in Missouri set up an experiment to find out.

　　First，the amount of alcohol in 27 different popular energy drinks was measured.All but one had an alcohol level greater than 0.005%.In nine of the 27 drinks，the alcohol level was at least 0.096%.The scientists then investigated the possibility that these small levels of alcohol could be discovered by an ABT.They asked test subjects to drink a full can or bottle of an energy drink and then gave each subject an ABT one minute and 15 minutes after the drink was finished.

　　For 11 of the 27 energy drinks，the ABT did find the presence of alcohol if the test was given within one minute after the drink was taken.However，alcohol could not be discovered for any of the drinks if the test was given 15 minutes after the drink was consumed.This shows that when the test is taken plays an important role in the test result.The sooner the test is conducted after the consumption of these drinks，the more likely a positive alcohol reading will be obtained.

　　小題1:What is the legal alcohol level for a 20­year­old driver in the US?A.0.000%.　B.0.005%.

　　C.0.080%.　D.0.096%.

　　小題2:What is the purpose of the Missouri experiment?A.To introduce a new method of calculating blood alcohol levels.

　　B.To discover the relation between energy drinks and ABT test results.

　　C.To warn people of the dangers of drinking energy drinks.

　　D.To change the current legal alcohol limit for drivers in the United States.

　　小題3:The underlined word “subjects” in Paragraph 2 refers to________.A.the things that are being discussed

　　B.areas of knowledge studied in school

　　C.the participants in an experiment

　　D.the people who belong to a country

　　小題4:Which of the following affects the ABT test result most for energy drink consumers?A.The age of the person who takes the test.

　　B.The place where the test is given.

　　C.The equipment that the test uses.

　　D.The time when the test is taken.

　　小題5:Which of the following is true according to the passage?A.A driver whose blood alcohol level is found to be 0.1% will be arrested.

　　B.No energy drinks really cause anyone to test positive on an ABT.

　　C.Few popular energy drinks contain alcohol in them.

　　D.Those taking an ABT 15 minutes after drinking alcohol cannot be found out.

　　參考答案及解析

　　小題1:C

　　小題2:A

　　小題3:C

　　小題4:C

　　小題5:D

　　語篇解讀　本文是一篇科研報告。主要研究了能量飲料和測試血液中酒精濃度之間的關(guān)系。

　　小題1:解析：　細(xì)節(jié)理解題。根據(jù)文章第一段第二句“In the United States，the legal blood alcohol limit is 0.08% for people aged 21 years or older，while people under 21 are not allowed to drive a car with any level of alcohol in their body.”可知，答案A符合文意。

　　答案：　A

　　小題2:解析：　細(xì)節(jié)理解題。根據(jù)文章第一段倒數(shù)第二句：“Can one of these energy drinks really cause someone to test positive on an ABT?Researchers in Missouri set up an experiment to find out.”可知，答案B符合文意。

　　答案：　B

　　小題3:解析：　詞義猜測題。根據(jù)語境可知，文章中畫線句子的意思是：他們要求參加測試的實驗者喝下一滿聽或一瓶能量飲料，然后在一分鐘和十五分鐘后對其ABT進(jìn)行測試。由此可推知，此處的subject是指參與實驗的人。

　　答案：　C

　　小題4:解析：　細(xì)節(jié)理解題。根據(jù)文章最后一段中的“the test was given within one minute...15 minutes...This shows that when the test is taken plays an important role in the test result.The sooner the test is conducted after the consumption of these drinks，the more likely a positive alcohol reading will be obtained.”可知，在飲用功能性飲料多久之后進(jìn)行測試會影響測試效果。

　　答案：　D

　　小題5:解析：　推理判斷題。根據(jù)文章第一段可知，合法的血液酒精濃度最高值應(yīng)該是0.08%，如果超過這個濃度，司機就會被警察逮捕。由此可推知，答案A符合文意。

　　答案：　A