A Because they want algae to produce sugars and starches.
C Because they want to turn plant sugars to a new form of energy.
38. According to the fifth paragraph, under what conditions are algae able to use solar energy to make hydrogen?
B When there is no oxygen in the air.
D When enough starch is stored.
A It is not possible to remove sulfate from the environment.
C It is not easy to make sugars instead of hydrogen.
40. What is NOT true of algae?
B They can be a very good fuel source.
D They can be used in many ways.
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