A. enables man to alter the weather
B. makes weather prediction easier
C. gives the scientist information not obtained readily otherwise
D. uses electronic instruments
27. One characteristic of weather maps NOT mentioned by the author in this passage is
A. fronts B. thermal changes
C. frost D. wind speed
28. The thirty-day forecast is determined by examining_______.
A. daily weather maps B. upper air levels
C. satellite reports D. changing fronts
29. At the present time, experiments are being conducted in_____
A. 30-day outlook B. controlling storms
C. controlling weather D. determining density of pressure groups
30. Artificial rainmaking has been most successful in the_______.
A. lake area B. western slope of mountains
C. grass lands D. windward side of mountains
26. C 27. B 28. B 29. C 30. D
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