Trên cùng một nửa mặt phẳng bờ chứa tia Ox, vẽ tia Oy và Ot sao cho xOy= 30 độ ,xOt=70 độ a) Trong 3 tia Ox,Oy,Ot,tia nào nằm giữa 2 tia còn lại. b) Tính góc yOt ,tia Oy có phải là tia phân giác của góc xOt không ?

hold;   picks up;   even;   help;   after;   thickly;   little;   hillsides 

Wind, water, air, ice and heat all work to cause erosion. As the wind blows over the land, it often (1)_______  small grains of sand. When these grains of sand strike against solid rocks, the rocks are slowly worn away. In this way, (2) _______ very hard rocks are worn away by the wind.

When particles of rocks or soil became loosened in any way, running water carries them down the (3) _______ Some rocks and soil particles are carried into streams and then into the sea.

Land that is covered with trees, grass and other plants wears away very slowly, and so loses very (4) _______ of its soil. The roots of plants help to (5) _______ the rocks and soil in place. Water that falls on grasslands runs away more slowly than water that falls on bare ground. Thus, forests and grasslands (6) _______  to slow down erosion.

Even where the land is (7) _______  covered with plants, some erosion goes on. In the spring, the melting snow turns into a large quantity of water that then runs downhill in streams. As a stream carries away some of the soil, the stream bed gets deeper and deeper. (8) _______  thousands of years of such erosion, wide valleys are often formed.

giúp mik với nhé !.cảm ơn

C. BÀI TẬP:

❶. PHONETICS

I. Choose the words whose underlined part is pronounced differently from that of the others in each group

1. A. brown                             B. now                                    C. bowl                       D. how

2. A. packet                             B. egg                          C. lettuce                     D. lemon

3. A. chest                               B. lunch                       C. bench                      D. schools

4. A. lettuce                            B. tube                                    C. music                      D. student

5. A. noodles                           B. shoulders                C. packets                   D. tomatoes

6. A. mind                               B. climb                       C. exciting                   D. destination

7. A. sugar                               B. sorry                       C. seaside                    D. summer

8. A. busy                                B. why                                    C. history                    D. family

9. A. page                                B. village                     C. luggage                   D. heritage

10. A. what                             B. which                      C. where                      D. who

11. A. afternoon                      B. can                          C. lack                         D. animal        

12. A. paper                            B. way                         C. prepare                    D. later           

13. A. party                             B. glass                        C. plant                       D. plastic        

14. A. happy                           B. match                      C. package                  D. save           

15. A. swap                             B. vase                                    C. watch                      D. want          

16. A. recycle                          B. environment           C. charity                    D. invite

17. A. paper                            B. bag                          C. plastic                     D. natural

18. A. cousin                           B. cycle                       C. encourage               D. container

19. A.polluted                         B. prepared                 C. recycled                   D. watered

20. A. benches                        B. boxes                       C. fridges                    D. arms

C. BÀI TẬP:

❶. PHONETICS

I. Choose the words whose underlined part is pronounced differently from that of the others in each group

1. A. brown                             B. now                                    C. bowl                       D. how

2. A. packet                             B. egg                          C. lettuce                     D. lemon

3. A. chest                               B. lunch                       C. bench                      D. schools

4. A. lettuce                            B. tube                                    C. music                      D. student

5. A. noodles                           B. shoulders                C. packets                   D. tomatoes

6. A. mind                               B. climb                       C. exciting                   D. destination

7. A. sugar                               B. sorry                       C. seaside                    D. summer

8. A. busy                                B. why                                    C. history                    D. family

9. A. page                                B. village                     C. luggage                   D. heritage

10. A. what                             B. which                      C. where                      D. who

11. A. afternoon                      B. can                          C. lack                         D. animal        

12. A. paper                            B. way                         C. prepare                    D. later           

13. A. party                             B. glass                        C. plant                       D. plastic        

14. A. happy                           B. match                      C. package                  D. save           

15. A. swap                             B. vase                                    C. watch                      D. want          

16. A. recycle                          B. environment           C. charity                    D. invite

17. A. paper                            B. bag                          C. plastic                     D. natural

18. A. cousin                           B. cycle                       C. encourage               D. container

19. A.polluted                         B. prepared                 C. recycled                   D. watered

20. A. benches                        B. boxes                       C. fridges                    D. arms