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.

　　6．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%.

　　7．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.

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