题目内容：
根据下列材料，请回答题：While it's easy enough to brush off a few sleepless nights with a pot of coffee and the occasional desk nap, you may be doing more harm than you realise. According to a new study from Surrey University, having less than six hours of sleep per night can actually shut down genes that play a key role in the body's 36 of self-repair.
We rely on our genes to constantly produce the proteins needed to 37 the wear on our bodies'tissue that we suffer throughout the day. But when scientists divided 26 volunteers into two groups—one of which slept for less than 6 hours per night for an entire week and the other for 10 hours per night—some of the sleep-deprived group's genes actually stopped working.
The functions of 711 genes in total were altered in some way, 38 ones involved in metabolism ( 新陈代谢), inflammation (炎症), immunity and stress. There is some good news though: a week of normal sleep was enough to 39 the malfunctioning genes back to peak condition, but should the40 sleep patterns continue, health problems that aren't, quite so easily reversible, like obesity (肥胖)and heart disease, have a 41 chance of cropping up. And this study only scratches the 42.
according to Professor Colin Smith, one of the scientists 43 in the study: This is only a week of sleep 44 and it is only five and a haft or six hours a night. Many people have that amount of sleep for weeks, months and maybe even years so we have no idea how much 45 it might be.
A．accessing
B．amounted
C．approaching
D．attract
E．casual
F．charactexs
G．fresh
H．ignore
I．increasingly
J．messages
K．patiently
L．tiny
M．total
N．violated
O．vital
请回答（36）题__________.
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