初中英语河北加拿大版学生用书 13

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[by:喜欢tingclass.net，请把tingclass.net告诉你QQ上的5位好友，多谢支持！] [00:00.00]听力课堂网 Lesson 13: [00:04.10]Why Are Plants Important? Why Do We Need Trees [00:11.26]JENNY:Let's talk about trees and why we need them. [00:17.92]Trees help clean the air. [00:22.07]They give us food--like apples,bananas and oranges. [00:28.73]DANNY:How about donuts?I want to plant a donut tree...mmm...donuts! [00:38.69]BRIAN:Donuts don't grow on trees! [00:42.45]But we can make and build things with trees--like chairs,beds and houses! [00:50.18]DANNY:Sometimes the weather is sunny and hot. [00:55.82]Then we can sit under a tree in the shade. [01:01.28]JENNY:We make books from trees.Also,many animals live in trees. [01:08.83]DANNY:Do plants do other things? [01:12.91]BRIAN:Plants cover the soil. [01:16.75]The the wind and water don't carry the soil away. [01:22.31]JENNY:All plants take energy from the sun and make it into food. [01:29.26]People and other animals need the food to live. [01:35.03]DANNY:I need food to live. [01:38.80]Dinosaurs need a lot of food [01:43.76]They need a lot of donuts! [01:48.02]Food for Everything [01:51.67]All living things need food for energy [01:57.03]Plants and animals are living things. [02:02.07]Without a way to get energy,they would die. [02:07.53]Plants and animals get their food in different ways. [02:13.30]A plant uses the energy in sunlight to make food for itself. [02:20.56]Some animals eat plants. [02:24.33]Some animals eat other animals.These animals are predators. [02:31.69]What is energy? Light is energy. Heat is energy.Oh,no! [02:39.87]What's "heat"? "Heat" and "hot"go together.Hot things have heat. [02:49.12]Now do you know what "energy" is? [02:53.09]Are plants important to all animals? [02:57.95]Some animals don't eat plants,but plants feed all animals! [03:05.50]How?Think of a tiger. The tiger eats animals that eat plants. [03:14.17]Without plants,the tiger would have nothing to eat. [03:20.41]A one-plant animal? Some animals eat only one plant.Pandas eat bamboo. [03:30.57]Do they eat fruit? No.Do they eat grass? No!Only bamboo. [03:39.72]Big pandas eat eighteen kilograms of bamboo every day! [03:47.47]What does "kilogram"mean?It's in the dictionary! [03:54.42]Look it up!

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