练习一
| B | D | A | A | B | D | C | A | A | D | A | C | C | C | D |
练习二
| D | C | B | A | B | B | A | B | B | C | A | B | A | C | D |
练习三
| C | B | D | D | B | A | D | B | A | C | A | C | C | D | B |
练习四
| D | A | B | C | A | B | B | A | D | A | C | D | B | A | C |
练习五
| A | C | D | B | B | A | C | C | A | D | B | C | A | D | A |
练习六
| D | A | D | A | D | A | C | C | D | C | B | A | B | D | B |
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