What is the conversation mainly about？
A more economical diesel fuel.
B. Characteristics of a new type of fuel.
C. Where is a new energy source located？
D. How to develop alternative energy sources.
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What effect will the increased use of DME instead of diesel fuel probably have？
A. It will reduce the amount of pollutants in the air.
B. It will increase the amount of unpleasant odors from vehicles.
C. It will eventually destroy the ozone layer.
D. It will reduce the cost of running large vehicles.
Before the museum is actually built, all of the following have to be done EXCEPT
A. soliciting half the museum's price tag from private donors.
B. choosing an architect.
C. choosing a director of the new museum.
D. assembling the collection.
The passage mainly focuses on
A. the explanation of efficient market.
B. the exchange of different currencies.
C. how to make profits from stock market.
D. how to catch the profit opportunities.
The economists think the profit opportunities are rare because
A. the market is not efficient.
B. too many people go for it.
C. the prices are always fluctuating.
D. few people have the clear insights,
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