背光板的主要作用是什么？（）A.给灯管供电 B.提供高频震荡 C.电磁转换 D.交流

男性，30岁。乏力盗汗一月余，咳痰带血两天，既往胸膜炎病史，X片示左肺尖密度不均影；ESR30mm/h，WBC6.0×10g/L。

如前述各项检查均无异常，采取哪项治疗措施为宜（）

A.肌注青霉素

B.静滴红霉素

C.静滴头孢类抗生素

D.SM+INH⁺PAS

E.INH⁺RFP+EMB

完形填空。

The story I'm going to tell truly happened in my life.      The other day, I met a man outside the gym who   1   a movie star. He was handsome and smiling. His upper body was muscular and he   2   to be on top of the world.      "How are you?" I   3   with a smile. "I'm doing really well," he replied in a cheerful voice. His enthusiasm and big smile   4   the parking garage.   5   as he walked up, I   6   his long legs were thin and I saw he had a silver carte (手杖). "Why do you need that cane?" I couldn't'   7   thinking he had a minor injury. "I have MS (多发性硬 化病)," he answered in a   8   voice too, as his broad smile   9   left his face. Multiple Sclerosis is a very serious disease and often painful. I looked at him from my little red sports car and said, "You  10  it very well. You seem like a happy man  11  MS." Without losing a bit of his smile he replied, "I am a happy man," and then added, "I'd be even happier if I had that sports  12 ."      It was ironic (讽刺的). Just  13  we spoke, I'd been sitting in that little sports car, feeling sad about my painful shoulder over the last 11 months although I was  14  after an operation. Here's a man with a  15  far tougher than mine, but his positive attitude made him feel no  16  happiness. He went on with his enjoyment of life as usual, which moved me deeply.      It was also a wonderful reminder of that old  17 , "I cried because I had no shoes. Then I met a man who had no feet." 18  your problem is, just keep in  19  that none of us goes through life  20  and like the man with MS, make the most of what you have. Count your blessings.

( )1. A. stared at     ( )2. A. conducted     ( )3. A. questioned    ( )4. A. lit up        ( )5. A. So            ( )6. A. diagnosed     ( )7. A. want          ( )8. A. cheerful      ( )9. A. sometimes     ( )10. A. need         ( )11. A. in spite of  ( )12. A. training     ( )13. A. when         ( )14. A. recovering   ( )15. A. direction    ( )16. A. fewer        ( )17. A. story        ( )18. A. Whatever     ( )19. A. head         ( )20. A. completely   B. talked about  B. appeared      B. advised       B. put up        B. And           B. noticed       B. set           B. sad           B. regularly     B. handle        B. in return for     B. coach         B. until         B. suffering     B. location      B. less          B. news          B. However       B. brain         B. easily        C. agreed with  C. performed    C. complained   C. held up      C. But          C. examined     C. wait         C. low          C. never        C. demand       C. thanks to    C. coat         C. before       C. repairing    C. situation    C. further      C. saying       C. Whichever      C. heart        C. hardly       D. looked like D. pretended   D. greeted     D. kept up     D. Though      D. checked     D. help        D. painful     D. always      D. deal        D. but for     D. car         D. since       D. benefiting                   D. position    D. more        D. lesson      D. Whenever    D. mind        D. lightly

如图所示，边长为a正方形ABCD为一玻璃砖的横截面，此玻璃的折射率n＞

2

．一束强光从AD的中点O以入射角θ（0≤θ＜90°）射向玻璃砖．下列说法正确的是

①．改变θ的大小，可以使光线在AD面发生全反射而不能射入玻璃砖

②．改变θ的大小，可以使光线在BC面发生全反射

③．改变θ的大小，可以有部分光线能到达CD面

④．θ无论取何值，都有光线从BC面射出（　　）

A．③④

B．①②

C．①③

D．②④

如图所示是甲、乙两种物质的溶解度曲线．请回答下列问题：

（1）P点的含义是______．

（2）t₂℃时，把2.4g乙固体放入10mL水中（水的密度约为1g/cm³），充分搅拌，所得溶液的质量是______g．

（3）t₂℃时，在90g 10%的乙溶液中加入15g乙固体，充分搅拌，所得溶液的溶质质量分数为______．

下列说法关于Authoiware中视频图标来说错误的是（）。

A.可以使用它实现对旧教更多的控制

B.使用不可以对视频信息的次进行排序

C.利用它，可以在运行交互式程序的同时，实时加载和控制视频信息

D.使用它可以对视频信息的次进行排序