The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: You can grow them in a reactor, in a pond. You can grow them in the ocean. Theres a lot of flexibility in how you can use these organisms.
How do plants relate to solar energy?__________.
A.They are the, real experts in producing it.
B.They have been a source of it.
C.They have been used to produce it.
D.They have been using it for billions of years.
37、Scientists study how photosynthesis works because they want to__________.
A.improve the efficiency of it
B.turn plant sugars to a new form of energy
C.make green plants a new source of energy
D.get more sugars and starches from plants
38、Algae are able to use solar energy to produce hydrogen when__________.
A.they are grown in narrow-necked bottles
B.there is enough oxygen in the air
C.enough starches is stored
D.there is no oxygen in the air
39、Researchers find it difficult to make algae produce hydrogen efficiently because__________.
A.removing the sulfate slows down hydrogen production
B.it is hard to create an airfree environment
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