58.(A)ccording to the passage, our serf-images _________. (A). have positive effects (B). are probably untrue (C). are often changeable (D). have different functions

64.　　　　　　　　　　　　　　　　　　　　　　 The writer uses the two questions at the beginning of the passage to _______. (A). test the readers' knowledge about waves (B). draw the readers' attention to the topic (C). show Jamie Taylor's importance (D). invite the readers to answer them