2019年全国英语等级考试三级阅读理解习题（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.

　　小题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%.

　　小题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.

　　小题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

　　小题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.

　　小题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.

　　参考答案及解析

　　小题1:C

　　小题2:A

　　小题3:C

　　小题4:C

　　小题5:D

　　语篇解读　本文是一篇科研报告。主要研究了能量饮料和测试血液中酒精浓度之间的关系。

　　小题1:解析：　细节理解题。根据文章第一段第二句“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

　　小题2:解析：　细节理解题。根据文章第一段倒数第二句：“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

　　小题3:解析：　词义猜测题。根据语境可知，文章中画线句子的意思是：他们要求参加测试的实验者喝下一满听或一瓶能量饮料，然后在一分钟和十五分钟后对其ABT进行测试。由此可推知，此处的subject是指参与实验的人。

　　答案：　C

　　小题4:解析：　细节理解题。根据文章最后一段中的“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，在饮用功能性饮料多久之后进行测试会影响测试效果。

　　答案：　D

　　小题5:解析：　推理判断题。根据文章第一段可知，合法的血液酒精浓度最高值应该是0.08%，如果超过这个浓度，司机就会被警察逮捕。由此可推知，答案A符合文意。

　　答案：　A