Unit 13 We're trying to save the earth Section A (1a~2d) 课时作业（含答案）

Unit 13 Section A (1a~2d)
【基础性作业】
一、用括号内所给单词的适当形式填空
1.We're trying 　 　 (save) the earth.
2.There used to 　 　 (be) sixty students in the classroom.
3.Their grandparents were 　 　 (fisherman) living near the sea before they moved to the town.
4.There are many kinds of 　 　 (pollute) around us.
5.All of the students should take part in 　 　 (keep) our school clean and tidy.
【拓展性作业】
二、补全对话(有两项为多余选项)
Bob:Good morning, Kim.
Kim:Good morning.
Bob:6.　 　 It can save a lot of time.
Kim:Well, I prefer walking to driving a car.
Bob:Mmm... it's good for health and the environment.
Kim:Yes. The environment is very important for us. 7.　 　
Bob:Yeah, that's right. What else can we do
Kim:For example,we'd better not buy clothes made of animals' fur.
Bob:I agree with you. 8.　 　 Anything else
Kim:Don't use plastic bags.
Bob:9.　 　
Kim:Yes,they are really useful for us. But they also pollute our environment.
Bob:10.　 　
Kim:We can use cloth bags instead of plastic ones.
Bob:That's a good idea. Oh, it's late. I must go now. See you!
Kim:See you!
A.Everyone should do something for it.
B.Why don't you drive to work
C.It's useless for protecting plants.
D.It's a good way to protect animals.
E.But don't you think they are really convenient in our daily lives
F.Why do you go to work in a car
G.How can we carry things after shopping, then
【综合性作业】
三、完形填空
　　(跨学科·化学)We have been used to wearing masks (口罩) 　11.　 public. About 30.0. million masks are used and then 　12.　 every day in China. Where do these masks go You might think they just go in a rubbish bin. But that's just the 　13.　 stop on the masks' journey.
After the masks are thrown into the bins,rubbish trucks 　14.　 the bins and take the rubbish to landfills (垃圾场).Next, the masks will be taken to rubbish incinerators (焚化炉) and 　15.　. Burning masks might not seem to be very good for the environment. Won't it cause pollution
The answer is “no”, according to China Daily. The main material of most masks is polypropylene (聚丙烯).It's non-toxic (无毒的).　16.　 burning, it changes into water and CO2..
In fact, burning the masks 　17.　 bring some benefits (益处).The process of burning the rubbish can produce electricity. Burning one ton of rubbish can produce more than 40.0. kilowatt hours (度) of electricity. Some people make a prediction 　18.　 there will be 16.2.,00.0. tons of used masks in China this year. Burning all of them can produce more than 64. million kilowatt hours of electricity. This is enough to make an electric car 　19.　 about 37.0. million km, which is 9.,25.0. times as long as the earth's equator.
　20.　, the slag (炉渣) from burning masks can be recycled to make bricks (砖块) or fill the roads.
( )11.A.at B.for C.in D.about
( )12.A.thrown down B.throw down C.throw away D.thrown away
( )13.A.last B.first C.second D.final
( )14.A.empty B.fill C.fix D.make
( )15.A.turned B.built C.burned D.broken
( )16.A.After B.Before C.For D.About
( )17.A.must B.can C.should D.may
( )18.A.who B.that C.what D.where
( )19.A.to keep B.keep C.drive D.to drive
( )20.A.After all B.At least C.At last D.At first2
参考答案
Section A (1a~2d)
基础性作业
1.to save　2.be　3.fishermen　4.pollution　5.keeping
拓展性作业
6~10　BADEG
综合性作业
11~15　CDBAC　16~20　ABBCC