【正文】 want to concentrate while working at the puter and the light helps brain． 60． The passage is mainly about ______． A． natural wakeup cycles B． the effect of light on sleep C． personal and health concerns D． functions of puter monitors 61． The underlined word which in Paragraph 2 refers to ______． A． normal bathroom lighting B． 10minute exposure to lighting C． the release process of a chemical D． a chemical affecting one39。s daytime, be awake,39。s natural wakesleep cycle and makes them sleepy at nightfall． Ten years ago, a team of British and American researchers detected a photopigment （光敏色素） in the human eye that signals to the body whether it is day or night, summer or winter． The photopigment is especially sensitive to blue light． The blue light more or less tells the body, 39。s Psychiatric Clinic in St． Hedwig39。t proved it though, says Dieter Kunz, the team39。s grandchild． 57． It can be inferred from the passage that the driver regretted ______． A． missing Ed39。d died． I never put it in the mailbox． I guess I should have written it sooner． His face was pale as he wiped his eyes with a handkerchief． When I got to my hotel room I didn39。m Tom, he explained． It39。d like to know that I was thinking of you． And it was ended with Your Old Friend, Tom． I thought your friend39。ve always delayed it． reminded me of myself． It went on to say that he often thought about the good times they had had together． When I read the part where it said Your friendship really means a lot to me, more than I can say because I39。t seem to find the time． But we used to find the time, he said． Take a look． He handed the letter over to me． The first sentence I39。t family, he replied, though he might just as well have been a regular member of the family． Old Ed and I grew up together． They were always friends． But since he moved away from the neighborhood 30 years ago, it39。 A I had to knock on the taxi to get his attention． Finally, the driver, a man about 60, looked up from behind the wheel and apologized, I39。t do nice things． I 54 thought about changing the way． But then I saw this as a chance to make a 55 . So I39。t 37 doing this with a white shirt and suit on． Nightfall was approaching． Suddenly a car pulled 38 from behind me． A man got out and offered to 39 me． Seeing his unpleasant appearance and tattoos （紋身） on his arm, I became 40 as thoughts of robberies flashed through my mind． But 41 I could say anything he had already begun to take the tools to change the 42 ． While watching him I happened to look back at his car and noticed someone sitting in the passenger seat． This had 43 me． Then, without 44 , it began to rain． He suggested that I wait in his car because my car was unsafe． As the rain increased, getting us wet within seconds I 45 agreed． When I settled into the back seat, a woman39。 I39。t decide ______ to order． A． when B． where C． what D． how 29． He told me to start early, ______ me that the roads would be crowded． A． reminding B． to remind C． reminded D． remind 30． —Have you got enough members? —Carol says she will join us ______ the salary meets her expectations． A． until B． if C． though D． unless 31． Even though Sara had practiced her speech repeatedly, she ______ its conclusion at the talk show． A． fets B． has fotten C． fot D． had fotten 32． After looking at many new cars, I found ______ which I would accept just as suitable． A． it B． this C． that D． one 33． I might be able to tell you which bus to take if I knew ______ on the map we are now． A． that B． where C． what D． how 34． If you had brought your swimsuit with you, we ______ swimming in the lake now． A． could go B． could have gone C． can go D． have gone 35． —What a nice jacket! It looks good on me! —Don39。s no snake known that will habitually attack human beings unless _____ with its life． A． threaten B． threatened C． threatening D． having threatened 28． —Honey, what would you like to have? —I39。s the result of the football match? —Listen! The latest news about it ______． A． broadcast B． will broadcast C． is being broadcast D． has been broadcast 26． —What should I wear to the party? —Well, it isn39。s living standards, the central government will take more measures in the ing years． A． To raise B． Raise C． Raising D． Raised 24． He suddenly fell ill, ______ prevented him from attending his friend39。 a D． the。 a B． a。 例：