Researchers have found that every addictive drug causes ______ levels in the brain to increase

If you want to make your dorm room to appear larger, you should

a. paint the room in dark colors. b. paint the room with vertical stripes. c. paint the room in light colors. d. place a lot of furniture in the room. e. paint the room in alternating light and dark patterns.

From the age of two to six, a child's vocabulary increases from ________ to ________ words

a. 2,000; 4,000 b. 9,000; 24,000 c. 1,000; 10,000 d. 9,000; 20,000 e. 10,000; 40,000