Question 20 is based on the recording you have just heard.

Recording Two

    Psychological research shows we consistently underestimate our mental powers. If you think this does not apply to you, then here is a simple test to show you are wrong. Write down the names of all the American states you can remember. Put the list away and then set yourself the same task a week later. Provided you have not cheated by consulting an atlas, you will notice something rather surprising. The two lists will contain roughly the same number of states, but they will not be identical. Some names will have slipped away, but others will have replaced them. This suggests that somewhere in your mind you may well have a record of virtually every state. So it is not really your memory letting you down, just your ability to retrieve information from it.

    We would remember a lot more if we had more confidence in our memories and knew how to use them properly. One useful tip is that things are more likely to be remembered if you are in exactly the same state and place as you were when you learned them. So if you are a student who always reviews over black coffee, perhaps it would be sensible to prime yourself with a cup of coffee before the exam. If possible, you should also try to learn information in the room where it is going to be tested. When you learn is also important. Lots of people swear they can absorb new information more efficiently at some times of the day than at others. Research shows this is not just imagination. There is a biological rhythm for learning, though it affects different people in different ways. For most of us, the best plan is to take in new information in the morning and then try to consolidate it into memory during the afternoon. But this does not apply to everyone, so it is essential to establish your own rhythm. You can do this by learning a set number of lines of poetry at different times of the day and seeing when most lines stick. When you have done this, try to organize your life so that the time set aside for learning coincides with the time when your memory is at its best.

    Avoid learning marathons—they do not make the best use of your mind. Take plenty of breaks, because they offer a double bonus: the time off gives your mind a chance to do some preliminary consolidation and it also gives a memory boost to the learning.

20. What do we learn about the two lists in the test?

解析：B。本题目为细节题。问题为：从实验中的两组清单中，我们了解到什么？原文所在句：The two lists will contain roughly the same number of states, but they will not be identical.两组清单包含的州的数量大致相同，但是并不完全一致。正确答案为：B）They include more or less the same number of states。此题目对原文形容词部分做了替换，选项中的more or less 与原文中的roughly（粗略的）均表示一个大约值。