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respect
start out
live off
die off
n. 蜜蜂
n. 蚂蚁
n. 鸽子
v. 死
adj. 死的
n. 物种；种类
v. 尊敬；敬重
启程，出发；开始做
以……为食；以……为生
相继死去；灭绝
Words and expressions
Read the lesson and put these sentences in the correct order.
( )All living things are connected.
( )We should protect the environment.
( )Living things live in the world.
( )All living things need water and food to grow.
3
4
1
2
1. List some living things.
2. What will happen if people pollute the rivers and oceans?
3. What will happen if the birds eat the sick or dead fish?
4. What helps people grow big and strong?
5. What’s the effect if one species dies off?
Answer the following questions.