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31.Developed a half-century ago, GNP helped ______ a common way among countries of measuring change in economic output.

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30.The main measure of economic progress is the gross national product (GNP), ______ , this totals the value of all goods and services produced and subtracts loss in value of factories and equipment.

This basic fault can produce a ______ sense of national economic health. According to GNP, for example, countries that overcut forests actually do better than those that preserve their forests. 35.The trees cut down are counted as income but no subtraction is made for ______ the forests.

The answer to the question is ().

A. Theft.
B. Air crash.
Cheating.
D. Road accidents.

The answer to the question is ().

A. Learn the local customs.
B. Have the right documents.
C. Book tickets well in advance.
D. Make hotel reservations.

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