What is the correct definition of smog? A. gas made of three oxygen atoms

B. dirty or harmful substances in the environment

C. a yellow-brown haze that forms when sunlight reacts with air pollution

D. oil, coal, and natural gas used to provide energy

Matching: 1. first used by europeans as a local anesthetic; now abused for its euphoric effects 5 marijuana 2. found in coffee beans, tea leaves, and cocoa beans 2 heroin 3. prescribed for pain involving serious injury or surgery 1 morphine 4. illegal derivative of morphine that is sold on the street as a white powder 6 caffeine 5. can evoke feelings of terror and panic 4 lsd 6. causes user to experience a conscious dreamlike state 3 cocaine