题干

将小球藻置于盛有NaHCO3溶液的密闭容器中培养,在不同光照条件下该容器中氧气浓度随时间变化的曲线如图所示,据图分析错误的是(  )

A:0〜l0min净光合速率不变

B:0~15min光照强度小于15〜20min

C:15〜20min光合作用速率与呼吸作用速率相等

D:若20min后停止光照,则短时间内叶绿体中C5含量减少

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答案(点此获取答案解析)

B

同类题5

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    More than anything else in the world, Lion liked being King of the jungle.  He walked around, showing off his power and pride.

    Each day Lion took a long lazy sleep under the shade of his favorite tree.  He always dreamed of weaker animals bowing(鞠躬) before him.

    One day Mouse ran through the jungle and tripped over Lion's huge paws.  Lion woke up with a start. “How dare you wake me up!” he shouted angrily. Lion grabbed(抓住) Mouse with one paw. “On the second thought, I'm in the mood for the snack, and you'll make a delicious meal.” he said.

    Mouse cried out, “King Lion, please spare(饶恕) me! If you let me live, I'll always remember your kindness.  And, some day, I might be able to help you.”

    “How could such a powerless little mouse ever help me?” That thought made Lion laugh so much that he decided to let Mouse go.  A week later, Lion was walking through the jungle on the way to his favorite tree when he stepped onto a hunter's net.  The net scooped him up. No matter how he twisted (扭动) and turned, he couldn't escape.

    When Mouse heard Lion's frightened shouts, he raced to help. Mouse quickly chewed(咬)through the ropes to make a hole in the net.  Soon, Lion moved out and was free. Lion looked down at the little mouse. “Thank you for saving my life,” said Lion, smiling his widest smile.  “I was mistaken.  You are not a powerless little mouse. You are a great friend!”