18. A) By passing steam over dry ice.
B) By turning ordinary ice into steam.
C) By heating dry ice.
D) By mixing dry ice with ordinary ice.(A)
19. A) It takes a longer time to melt.
B) It is lighter to carry.
C) It is cleaner to use than ordinary ice.
D) It is not so cold as ordinary ice.(C)
20. A) In the 1920s.
B) In the 1930s.
C) In the 1940s.
D) In the 1950s.(A)
Part I
1. D
2. C
3. B
4. A.
5. A
6. B
7. D
8. C
9. B
10. D
11. B
12. D
13. C
14. B
15. C
16. A
17. D
18. A
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