Humans are unusual in the way they sleep．Most animals have a sleep during the day and tests have shown that a siesta can be beneficial for us too．It's even been recommended that airline pilots should have a nap during long flights so that they are more alert（警觉的）for the tricky business of landing.

　　So next time you nod off after Sunday lunch in front of the TV，don't feel embarrassed about it．Science，after all，is on your side．

　　9．The passage is probably from a

　　A. lab report

　　B. research paper

　　C. science story

　　D. drug instruction

　　10. When we are sleeping，

　　．

　　A. our heart beats more slowly

　　B. our body chemicals become fully controllable

　　C. our brain begins to show movies

　　D. our wound begins to heal

　　11. The underlined word “siesta” in the last paragraph but one means

　　A. a good rest

　　B. a little drink

　　C. a short sleep

　　D. a day dream

　　D

　　 We can stay young forever. That is the message Dr. Shen Ziyin wants to give the world. And the Chinese doctor claims that he has found an answer to the problems of aging.  

　　His solution is a herbal medicine to slow the process of aging.  

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