九年级英语练习册答案

九年级英语练习册答案

Unit 9 when was it invented ?

Section A

一： 1. invented 2.invention 3.adjustable 4.heat

5.slippers 二： 1~5 CBCCC

三： 1. What, used for 2. Who , invented 3. is , cleaned 4.must be repaired 5. to see

Section B

一： 1.notice 2. salty 3.produced 4. remain 5.pleasant

二： 2.too thin 2.by accident 3.According to, was discovered 4. by mistake 5.in this way ,in the end 6.fell into

三： 1~5：AADCD 6~10：BDBDC 11~12 ：AC

四： for, on, Who , think, are, inwentions, is , most

Self Check and Reading

一： 1.century 2.knock 3.below 4.wooden 5.towards 6. developing 7.divided 8.active 9.aim 10.create

二： 1.helpful 2.invention 3.salt 4.the most popular

5.safety

6.wood

三： 1.It is believed d 3. to learn 4.was sent

5.was handed in

6.Was ,cleaned

7.found him

8.When was, invented

四： 1~5：BADBA 6~10：CADAB

五： 1~5：ABCAC

6.He grew vegetables in his garden and sold them.With the money he set up a chemical lab.

7.Yes.Because he was awarded 1368 separate and distinct patents during his lifetime.

8.February 11th,1847 9.October 18th ,1931 10.America

11.Built a lab 12. 1368

13. His first patented invention was an electrical vote recorder in 1868.

14. 1876~1877,invented the phonograph.