66. Had it not been for cosmetic advances, as inferred from the passage, ____.

1. people would not have been as happy as they are today
2. the rate of facial birth defect would not have declined
3. there would not have been many more open smiles
4. we would not have seen smiling faces in public

67. According to the passage, it seems that whether there is a smile or not in the portraits or pictures is decided by ____.

1. one's internal sense of the external world
2. one's identity or social position
3. one's times of existence
4. All of the above

68. Trumble's study on smiles shows that ____.

1. an open smile can serve as a cover-up
2. the famous portraits radiate varying smiles
3. even the human muscles can arouse varying emotions
4. smiles can represent misinterpretations of different eras and cultures

69. What Trumble expects to see is ____.

1. the increasing tendency of broad grins and open smiles in public
2. further impact of Western medicine upon non-Western cultures
3. a wider range of meanings to be conveyed by smiles
4. more of sincerity and enthusiasm in public

70. At the end of the passage, the author implicates ____.

1. a fortune to come with cosmetic advances
2. an identical smile for everybody
3. future changes in life style
4. the future of smiles

(Reference keys.)