17、We can only break bad habits if others tell us to do so.——B. wrong
18、Bad habits may resume when we are under pressure. ——A. right
19、 Researchers were surprised by the answers that the volunteers gave in the first test. ——B. wrong
20、The volunteers found the test more difficult when they did it the second time. ——C. not mentioned
21、The study suggests that it is more difficult to respond to what we learn first. ——B. wrong
22、If we develop bad habits early in life, they are harder to get rid of. ——A. right