A
Do you feel a little sleepy after lunch? Well, that's normal. Your body naturally slows down then. What should you do about it? Don't reach for a coffee! Instead, take a nap.
There are many benefits of a daily nap. First of all, you are more efficient(有效率) after napping. You remember things better and make fewer mistakes. Also, you can learn things more easily after taking a nap. A 20minute nap can reduce information overload. It can also reduce stress. Finally, a nap may increase your selfconfidence and make you more alert (灵活). It may even cheer you up.
But, there are some simple rules you should follow about taking a nap. First, take a nap in the middle of the day, about eight hours after you wake up. Otherwise, you may disturb your sleepwake pattern. Next, a 20minute nap is best. If you sleep longer, you may fall into a deep sleep. After waking from a deep sleep, you will feel worse. Also, you should set an alarm clock. That way, you can fully relax during your nap. You won't have to keep looking at the clock so that you don't oversleep.
Now, the next time you feel sleepy after lunch, don't get stressed. Put your head down, close your eyes, and have_forty_winks.
午饭后是否感到困倦？那么小睡二十分钟吧，可以使精力更加充沛。
21．According to the passage, which is NOT a benefit of napping?
A．It makes you stronger.
B．It makes you feel happier.
C．It gives you more selfconfidence.
D．It improves your memory.
答案：A
解析：细节理解题。根据第二段中提到a nap may increase your selfconfidence, cheer you up, learn things more easily可知排除A。
22．What may happen if you don't use an alarm clock?
A．You may relax more.
B．You may feel too nervous to relax.
C．You may forget an important meeting.
D．You may not reduce your napping time.
答案：B
解析：细节理解题。 根据第三段最后三句可知不设闹钟就会紧张而不能放松。
23．In the last paragraph, “have forty winks” can be replaced by “________”．
A．do eyeprotection exercises
B．close your eyes for forty times
C．have a short sleep during the daytime
D．pretend to have a quick nap after lunch
答案：C
解析：词义猜测题。文章主要讲的就是午后小睡的益处，根据最后一段段意也可推出答案。
