---Where did you ____ Japanese?

       ---While I was staying with some Japanese students.

       A. pick up      B. take up                     C. make up     D. turn up

When the school year starts, it can be difficult to get up early．After a few early mornings, extreme tiredness might make you feel like you’re going to fall over．The amazing thing is that you probably manage to stay awake all day long and into the night．But how?

A chemical in the brain called dopamine（多巴胺）might be part of the answer．According to new research, dopamine is what keeps people who don’t get enough sleep from conking out．The chemical also has a complicated influence on your ability to think and learn when you don’t get enough sleep．

To study sleep loss and its effect on the brain, scientists rounded up 15 healthy volunteers．The scientists tested each person’s memory and ability to pay attention twice: once after a good night’s sleep and once after being kept up all night long．During the tests, the scientists measured levels of dopamine in the brains of the volunteers．

The results showed that when the volunteers stayed up all night, dopamine levels increased in the brain．Higher levels of dopamine kept the volunteers awake even though they felt tired．Some people are amazingly able to think clearly and react quickly, even when they haven’t had much sleep．Other people have a really hard time paying attention when tired, and their reactions are slow．All of these may be related to the dopamine levels．However, the researchers found that higher levels of dopamine don’t remove the trouble that people have thinking and learning while sleep-deprived （缺乏睡眠的）．

55．The underlined phrase “conking out” in the second paragraph probably means      ．

       A．staying awake        B．falling asleep         C．paying attention     D．falling over

56．With a higher level of dopamine, one      ．

       A．will not dream dreams at night               B．may have trouble in falling asleep

       C．can still stay awake after staying up           D．can do better in learning and working

57．We can infer from the last paragraph that         ．

       A．not all people can react quickly after they stay up late

       B．dopamine in our brain does not work when we are sleeping

       C．lack of sleep has no influence on one’s learning and thinking ability

       D．the higher the dopamine levels are, the less quickly one reacts

58．The passage is developed by         ．

       A．setting up a point and discussing it

       B．giving examples and drawing a conclusion

       C．pointing out similarities and differences  

      D．showing a fact and explaining the cause

---Do you go to swim every day?

---No, but I ________.

A. used to do     B. used               C. used to do it so       D. used to

 Every year _____ money and energy is spent on environment protection. [来源:学_科_网

   A. large quantities of   B. a large number of   

C. a large quantity of   D. a plenty of

路灯距地面为米，一个身高为米的人以每秒米的速度匀速地从路灯的正下方沿某直线离开路灯，那么人影长度的变化率为           米/秒（精确到）；

His remark was considered to be quite _____, because it deepened the gap between two parties and caused more conflicts.

       A. out of place       B. out of mind       C. out of question   D. out of order

Professor Jordan gave us _______ lecture this afternoon and most of us were confused.

A. a more confusing     B. more confusing a C. a most confusing D. the most confusing

V.单词拼写    5%

62. The Tian’anmen Square(天安门广场) is d_______ with more than 300,000 pots of flowers as tourists begin to travel in a crowd to Beijing with the week-long National Day holiday.

63. The man’s s________ was surprising, as the doctors thought he would die.

64. The Great Wall was rebuilt during the Ming D_______

65. To my joy , I got a very friendly r__________ when I arrived there

66. At least 203 miners were killed, 22 injured and 13 trapped in a coal mine gas e________.

 --ZhangYining has trained continuously for six hours.   

--______ she is tired out.

A. There is no wonder             B. There is no need   

C. It is no doubt                   D. It is no wonder

 Is this the third time that you ________ late?

A. have been        B. am         C. was        D. had been