1 . If you run very fast for a long time, you will lose your ______.

A．border

B．fabric

C．carpet

D．breath

2 . Write a word you have learnt in this unit before each definition
1. _________a part of the body that has a particular purpose, such as the heart or the brain
2. _________a chemical, usually a liquid, that has a pH of less than seven
3. _________one thousandth of a metre
4. _________energy sent out in waves
5. _________material used for making cloth, curtains, etc.
6. _________ a person who has been attacked, injured, or killed

3 . 英译汉
1. premier ________________________
2. institute   ________________________
3. proportion ________________________
4. candidate ________________________
5. gain the upper hand   ________________________
6. fabric ________________________
7. fibre   ________________________
8. label   ________________________
9. mode   ________________________
10. delay ________________________