他匆忙往奶奶家赶。暴风雨太大，树都倒了，但是这并不能阻止他。

D. He hurries back to Grandma's house. The storm is too big. Trees are falling down. But it can't stop him.

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研究人员使树蛇从15米高的塔顶端飞行，过程中使用了4个摄影机拍摄蛇滑行的轨迹，以拍摄成三维立体图像。

They launched the snakes from the top of a 15-metre tower and used four video cameras to construct 3-D images of the animals’ trajectories.

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在老树周围的虫洞。(D)环绕成树的幼龄树。

Insect holes around an old tree. (d) Young trees surrounding a mature tree.

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