2021年考研英语一答案如下：
【第一篇阅读理解】
1. A
2. C
3. D
4. B
5. D
【第二篇阅读理解】
6. C
7. A
8. B
9. D
10. C
【第三篇阅读理解】
11. B
12. D
13. A
14. C
15. B
【完形填空】
16. B
17. C
18. A
19. D
20. B
21. D
22. C
23. A
24. B
25. D
【翻译】
26. The experiment showed that the students who received positive feedback performed better than those who received negative feedback.
27. The researchers concluded that the students' performance was influenced by the feedback they received.
28. The study suggests that positive feedback can improve students' performance.
29. The experiment provides evidence for the effectiveness of positive feedback.
30. The researchers recommend that teachers should use positive feedback to motivate students.
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