3. 常考句子：
1)The problem of Jet Lag is one every international traveler comes across at some time. (para.1)
2)The effects of rapid travel on the body are actually far more disturbing than we realize. (para.2)
3)He later blamed his poor judgement on Jet Lag. (para.3)
4)Now that we understand what Jet lag is，we can go some way to overcoming it.(para.4)
5)The other belongs in our internal clocks which，left alone，would tie the body to a 25 hour - yes，25 - rhythm.(para.5)
6)In time the physiological system will reset itself，but it does take time. (para7)
7)One reason for this discrepancy is that different bodily events are controlled by different factors. (para.8)
8)It is not feasible to wait four days until the body is used to the new time zone. (para.9)
第九单元
1.常考单词：
classify approximate proportion appreciation acknowledge alter lengthen wealthy neglect expectation
2. 常考词组：
to approximate to resistance to to cope with attribute … to
3. 常考句子：
1)Nation classified as “aged” when they have 7percent of more of their people aged 65 or above. (para.1)
2)The nearer a society approximates to zero population growth，the older its population is likely to be - at least，for any future that concerns us now.
3)The older you are now，of course，the greater this proportion will be，and greater still if you are a woman.
4)If you are now in your thirties，you ought to be aware that you can expect to live nearly one third of the rest of your life after the age of 60.
