金属钾在氧气中燃烧能生成超氧化钾(KO₂)，KO₂与CO₂或水作用均生成O₂。现将一定量钠钾合金在足量氧气中燃烧，将反应产物置于水中并通入足量的CO₂，充分反应后，最多放出O₂的体积是最多吸收CO₂的体积的，则原钠钾合金中钠与钾的质量之比为(　　)

A．23?36 　　 B．46?39 　　　 C．115?39 D．23?78

　　From the very beginning, Martin felt that he was bound up with（与……紧紧地在一起）his lovely little patient. One day, following some tests , Betty gave the doctor a big hug（拥抱）.

　　A few months later the doctor removed not only the tumour（肿瘤）, but also the entire lower left side of Betty’s gum（牙龈）and jawbone. Because Betty was so young, Martin was hopeful that her jawbone might regenerate.

　　Within three months, Betty’s tumour grew as large as an orange, changing the natural appearance of the left side of her small, delicate （ = thin; not strong）face. Soon she couldn’t even close her mouth, and as her eating problems worsened, Betty ‘s weight dropped from 20 kilos to 15. Martin knew from experience that it might invade the brain.

　　The only other possibility was thorough radiation therapy （放射疗法）. Night after night, Betty's father gave her injection, but the tumour remained as big as ever. Then one evening. Morgan noticed that the tumour had begun to change. It was actually becoming smaller! For two months her tumour appeared to be going away for ever. In the coming months, Betty’s tumour continued to appear. She was able to eat solid food once again. Her jawbone was regenerating. The tumour was gone.

　　67．What do you think the underlined word regenerate means? It means “________”.

　　A. lose one’s life

　　B. give a new life to

　　C. be made by hand

　　D. pass on from one generation to another

　　68．If Betty’s jawbone didn’t regenerate, the doctors ________ .

　　A. would rebuild her jaw

　　B. would continue the treatment

　　C. would use new medicine

　　D. could do nothing else

　　69．If the brain should be invaded, the result would ________.

　　A. prevent her growth

　　B. reduce her weight

　　C. cause her brain damaged

　　D. affect her eyesight

　　70．What did the doctors do two months later?

　　A. They continued their observations.

　　B. They gave up the operation on Betty.

　　C. They found out what caused Betty’s strange disease.

D. They declared that Betty’s strange disease was cured.

从每小题的A、B、C、D四个选项中，找出其划线部分与所给单词的划线部分读音相同的选项，并在答题卡上将该选项涂黑。

1.beach      A．head　　　B．great　　　C．break　　　    D．season

2.educate     A. medal      B. prepare     C. effect          D.  complete

3.doubt      A．habit　　  B．above　　 C．club　　　    D. climb

4.exist       A．expert    B．example　　C．expect　　　  D．excellent

5.question    A emotion    B situation      C suggestion      D information

语音知识（共5小题；每题1分，满分5分）
从 A、B、C和D四个选项中，找出其划线部分与所给单词的划线部分读音相同的选项。
1. dangerous    A. Canadian    B. January      C. balance       D. advanced
2. exact        A. expert      B. exhibition     C. exercise      D. exist
3. ground      A. house       B. country      C. group        D. cough
4. spare　　    A. fear　　　  B. earn　　　   C. pear　　　    D. beard
5. smooth    A. feather      B. tooth       C. thief        D. warmth