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阅读下面短文，完成短文后的问题。
Many students want to improve their memories and learn
better. Today we will introduce some no-cost things you can do.
Exercise
Before you study, doing exercise may help you better remember what you will learn. Recently, researchers have found that people who did 15 minutes of training remembered more words. Scientists say the best time to exercise is right before you study. It can make you more active.
Pre-study test
The students who take a test before
studying remember more information than those who don't. For example, if you are
using an English textbook, you might first look at some important words at the
end of the unit. You could ask yourself what they mean, or how they are used. While
you might not know the answer, you will probably have a goal to learn so that you
can remember the answer when studying!
Sleep
A study shows that sleep helps you to learn in two ways. An
expert explains that "A person with enough sleep can concentrate best."
He also says, " Sleep itself plays an important role in making the memory
stronger, which is necessary for learning new information.
Wakeful rest
When you finish studying, you often go straight to another
activity. Perhaps you play a video game or watch
TV. But researchers suggest that resting after you study
may help you remember what you've studied. In a study, even older adults who rested
for 10 minutes after learning new words remember more words and better.
