单选题：Algae are able to use solar energy to produce hydrogen when

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题目内容：

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

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经济总量是反映某种经济现象在一定时间、空间下的总规模、总水平或工作总量的综合指标。看总量，主要是看总供给与总需求是否平衡

经济总量是反映某种经济现象在一定时间、空间下的总规模、总水平或工作总量的综合指标。看总量，主要是看总供给与总需求是否平衡，增长是否合理，关键是看（　　）等重要指

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