问题
选择题
鱼的血液从鳃经过后，血液中增加和减少的气体分别是[ ]
A．氧气 氮气
B．氧气 二氧化碳
C．二氧化碳 氧气
D．氮气 氧气
答案
答案：B
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鱼的血液从鳃经过后，血液中增加和减少的气体分别是[ ]
A．氧气 氮气
B．氧气 二氧化碳
C．二氧化碳 氧气
D．氮气 氧气
答案：B
Mr. Li had never been up in an airplane before and he had read a lot about accidents. So one day when a friend came to his house and wanted to take him for a ride in his own small plane, Mr. Li was very . He thought to . "If I don't agree, my friend may not be happy. if I agree, I am really afraid that there might be some danger. " ,however, his friend made him believe that it was very , and Mr. Li got on the plane. His friend the engine发动机 and the plane began to move along on the ground of the . Mr. Li was very frightened and his eyes. After a minute or two he opened them, looked out of the window of the plane, and said to his friend,"Look those people down there. They look as as ants蚂蚁,don't they?" "Those are ants,"answered his friend. "We are still on the ground. "
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