The Secret of Falling Leaves落叶的秘密

秋天到了，树上的叶子呈现出了不同的色彩。秋风吹拂，树叶起舞，最终落在大地上，为自己一年来的工作画上了完美的句号。叶子为什么会在秋天变红或者变黄呢？它们又为何会落下呢？让我们一起去听老橡树讲述落叶的秘密吧。

In the City Park， there lives a wise old tree named Old Oak（老橡树）. One day， a group of curious young trees gather around Old Oak， eager to learn. They notice that some of their leaves are changing colors and falling to the ground.

“Old Oak，” asks Maple（枫树）， a young tree with red leaves， “why are our leaves changing colors？” Old Oak smiles and explains， “The colors are a sign that our leaves are getting ready to fall. As the days get shorter and the nights get longer， our leaves stop making chlorophyll（叶绿素）， which is what makes them green. Instead， the other colors that are always there， like red and yellow， start to show.”

Ginkgo（银杏）， a tree with yellow leaves， speaks up， “But why do our leaves have to fall？” Old Oak answers， “Leaves are like our food factories（食品工厂）. They use sunlight and water to make food for us. In winter， there isn’t enough sunlight and water for our leaves to keep making food， so our body saves energy by letting them go.”

“But what happens to our leaves when they fall？” Aspen（白杨）， a tree with golden leaves， chimes in（插话）. Old Oak chuckles（轻笑）， “Great question！ When our leaves fall， they create a blanket on the ground. This blanket helps keep the soil（泥土） warm and protects our roots（根） during the cold winter months. ”

“It’s like nature’s way of giving us a warm hug！” The young trees are happy to know the secret of their falling leaves.

读完了这个故事，你知道落叶的秘密了吗？传说，在神秘的大森林里，精灵在落叶下面藏了宝藏，只有将正确的表达连在一起才能找到宝藏哦。快用你在故事里学到的知识去寻宝吧！

Leaves turn red or yellow， because they stop to make chlorophyll.

Leaves turn red or yellow， because they stop making chlorophyll.

Leaves fall down，

because they stop making chlorophyll.

Leaves make

food for trees.

Leaves fall down，

because there is enough

sunlight.

Falling leaves

protect trees

from cold.

Falling leaves

protect trees

from hot.

Falling leaves

keep the soil

cold.

Falling leaves

keep the soil

hot.