corrections

Ex 1 paragraph healdings

1 E error I

2 B

3 F error A

4 I error D

5 H

6 G error E

ex 2 scans reading

7 A error B

8 B

9 C error A

10 B error D

11 C

12 D

13 A error B

ex 3 multi choice-reading

14 C error D

15 B error C

16 A

17 B error A

18 D error B

19 C

20 C