Vocabulary

A 1-8 large,energy,ground, must , own , catch

B 1-8 provided with , put into , pollutes , kills , throw away , important , protect , problems

Grammar

A1  1 apple , biscuit , egg , lemon , potato , tomato ,

   2 bread , coffee , juice , milk

A2 1-8 a an , some , some , a some , a some , a some , a some

A3 1-9 soup water , good food , teacup , tea , paper , a cup of coffee , milk , sugar

B 1-6 Are there , there aren't , Are there , there are , There is , There are

C 1-7 is , are , hamburger , some chips , a cup of coffee , a sandwich , a salad

     8-12 a glass of orange juice , a bowl of soup , some chicken legs , a bowl of rice , a glass of cola

Listening and speaking

A 1 -10 home,mountains , animals , provides, population , energy, rubbish , kills , own , protect

B 1 , 3, 5,  T T T ,      2 F The students pick up the rubbish on the beach 

    4 F Peter gives Ben some orange juice. 6 F It rains when they go back to school.

C 1 We can help by changing the way we travel

    2 This causes no pollution and keeps us fit too

   3 Because they are better for the environment than cars

   4 They pollute the air.  5 We should share it with our friends and neighbours.

Reading

A1 It is about 8,600,000 aquare kilometres in size

   2 More than 2,000,000 people live in the Sahara Desert

   3 Some of them move around from place to place with their camels. Others live in towns and cities.

   4 Different animals such as camels,snakes,foxes and birds live in the Sahara Desert

   5 There were many plants and rivers

B 1 by th e sea   2 go swimming  3 the sea horse and the starfish 4 dangerous fish

    5 can do harm to the sea too  6 fewer and fewer fish

C 1-10 6% , tall ,grow , live , monkeys , elephants , tigers , home , food , protect

Writing

A 2 People drive many cars on the road. This pollutes the air

   3 Ships put oil into the river. This pollutes the water

   4 People throw rubbish into the water. This kills fish

   5 Factories burn things to make energy. This pollutes the air

B omit

Integration

A 1 T 2 T       3 F The Earth takes 24 hours to turn in a full circle

      4 F The Earth goes around the Sun

B 1 Because if children breathe or eat lead,they can have many health problems. They can even die.

  2 Petrol,paint and children's toys    3 Because the paint pollutes the air and land

 4 They put them into their mouths 5 We must ask all companies to stop using lead in petrol,paint and toys

C1 1-8 bacbdadc   C2 omit

D We can ride bicycle and use public transport more often.This helps fight air polllution.

   Second,there are more and more buildings.They all look the same.We can plant more trees to make our city more beautiful.

 Finally,we throw away a lot of rubbish every day.This is bad for the environment.We can recycle as much as we can.

 I hope everyone can join us to help make our city a better place to live in.  

深圳家教·龙华家教谭老师编辑并录入，请先自己做再核对答案，第四单元答案请点击上一篇文章。