다음 빈칸에 들어갈 말로 가장 적절한 것은?Beeches, oaks, … | [법원직 9급 영어] 21년 1회차 기출문제 상세 페이지

다음 빈칸에 들어갈 말로 가장 적절한 것은?
Beeches, oaks, spruce and pines produce new growth all the time, and have to get rid of the old. The most obvious change happens every autumn. The leaves have served their purpose: they are now worn out and riddled with insect damage. Before the trees bid them adieu, they pump waste products into them. You could say they are taking this opportunity to relieve themselves. Then they grow a layer of weak tissue to separate each leaf from the twig it’s growing on, and the leaves tumble to the ground in the next breeze. The rustling leaves that now blanket the ground―and make such a satisfying scrunching sound when you scuffle through them―are basically       .

tree toilet paper

the plant kitchen

lungs of the tree

parents of insects