题目内容
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33 Algae are able to use solar energy to produce hydrogen when_____.
A they are grown in narrow-necked bottles.
B there is no oxygen in the air.
C there is enough oxygen in the air.
D enough starches is stored.
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A. Right
B. Wrong
C. Not mentioned
B an explosion of huge stats
C the thinnest particle
D the same amount of mass
E the existence of black holes
F a fraction of an inch
27 Black holes are formed after______.
A alternative energy production is no less than conventional energy production.
B the amount of alternative energy production from public lands is huge.
C they are the most typical conventional energy resources from public lands.
D geothermal resources are more important than the other two.
A. They became less aggressive towards other creatures.
B. They lost interest in people.
C. They started eating more.
D. Other animals started working with them.
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