是制作电木的原料．下列围绕此物质的讨论正确的是（　　）

    When the plane was waiting at the airport, a big snake climbed up the steps and into the plane. It went to sleep under the pilot's (飞行员的) seat. Nobody saw it. Soon the passengers (乘客) walked into the plane and it took off. A little girl called Mary took out a whistle (哨子) and began playing. But none of the passengers liked the music. Then the stewardess (女乘务员) asked Mary to stop.

    The noise of the plane woke the snake. It put its head out and looked into the pilot's room. The pilot saw the snake and was greatly afraid. He was very afraid that the snake would bite him so he could not control the plane, and the plane started to swing strongly from side to side. The stewardess told the passengers what was happening and asked them not to be afraid. Mary was not afraid at all. She ran to the pilot's room with her whistle and began to play slow music, then the snake went after her. The girl returned to her seat and the snake lying on the floor beside her, dancing to the music.

    When the plane finally landed at the airport, and people took the snake to a zoo near Mary's house. She often went to visit the snake.

在同一个平面内，直线a、b相交于点P，a∥c，b与c的位置关系是（　　）

我国特有的中华鲟和白鳍豚终身生活在水中．中华鲟用鳃呼吸，卵生；白鳍豚用肺呼吸，胎生．它们分别属（　　）

《2002年地球生态报告》显示，所有的自然资源会在2075年之前耗尽。这份报告除评估全球生态系统现状外，还根据每个国家人口数量和各国自给自足能力的平衡关系，计算各国的“生态脚印”大小，换言之，也就是指各国消耗资源时对自然环境造成的冲击程度。阿拉伯联合酋长国是在地球上留下最大“生态脚印”的国家。据此完成下列各题。