Trees are very important. They are everywhere. They can help our environment in many ways. Here are some of the positive effects about them.
They produce fresh air for human beings and animals to breathe.
Trees produce lots of oxygen for us and take in the carbon dioxide(二氧化碳).
They keep the earth’s temperature cool.
The carbon dioxide brings about the greenhouse effect to the earth.
Trees take in the carbon dioxide and beat the heat.
They stop the floods from washing the houses away.
Trees can slow down the speed of the floods. They help to absorb(吸收) water.
They clean up the dirty things in the air.
In some places, the air is badly polluted. Trees can help to clean them.
They prevent the loss of soil and water.
Roots of trees can hold soil together. This way, the soil cannot be moved around by wind or water.
They store water.
Forests are like a huge tank(缸). They can catch rainfall. When it rains, the water goes down into the soil. Water can be stored there.
They give us medicine.
Forests provide natural medicine for us. Some leaves of the trees are medicine, such as the gingko(银杏) leaves.
▲ Being in forests not only helps us calm down but also makes us more creative.
阅读短文,选择最佳答案。
()1. How do trees help us breathe?
A. They take in oxygen.
B. They produce oxygen.
C. They make carbon dioxide.
()2. Why does the writer think the forests are like a huge tank?
A. Because they look soft and wet.
B. Because they hold the soil together.
C. Because they help to store the water.
()3. How can the forests prevent the loss of soil and water?
A. By slowing down the rain.
B. By holding the soil together.
C. By storing the rain with the roots.
()4. Gingko leaves are mentioned to prove that .
A. forests have medical value
B. forests make beautiful views
C. forests provide people with food
()5. Which of the following can be put in the “ ▲ ”?
A. They carry our memories.
B. They help us relax and explore.
C. They are important to the environment.

1.B 2.C 3.B 4.A 5.B

1. 细节理解题：根据原文第一部分“Trees produce lots of oxygen for us and take in the carbon dioxide”可知，树木通过产生氧气来帮助我们呼吸，A选项“吸收氧气”、C选项“制造二氧化碳”均表述错误，因此选B。
2. 细节理解题：对应原文“They store water”板块的内容“Forests are like a huge tank(缸). They can catch rainfall...Water can be stored there.”，可知作者把森林比作大缸是因为森林可以储存水，A选项无依据，B选项是固土的作用，因此选C。
3. 细节理解题：根据原文“They prevent the loss of soil and water”板块的内容“Roots of trees can hold soil together. This way, the soil cannot be moved around by wind or water.”，可知森林通过根系固定土壤来防止水土流失，因此选B。
4. 细节理解题：原文“They give us medicine”板块提到“Forests provide natural medicine for us. Some leaves of the trees are medicine, such as the gingko(银杏) leaves.”，举银杏叶的例子是为了证明森林有药用价值，B“森林有美丽风景”、C“森林给我们提供食物”均不符合段落主题，因此选A。
5. 推理判断题：空格后句子“Being in forests not only helps us calm down but also makes us more creative.”意为身处森林不仅能帮我们平静下来，还能让我们更有创造力，和B选项“它们帮助我们放松和探索”的含义匹配；A选项“它们承载我们的回忆”在文中无相关表述，C选项“它们对环境很重要”是前文已经介绍过的树木对环境的作用，和本段描述对人的身心的益处不符，因此选B。