免疫监视功能低下时，易发生（）。 A.超敏反应 B.肿瘤 C.自身免疫病 D.移植排

板块构造学说是20世纪最重要的科学成果之一。下图为某种类型的板块边界示意图。回答1~3题。

1、图示的板块边界是[ ]

A、大陆板块与大陆板块的碰撞边界

B、大洋板块内部的生长边界

C、大洋板块向大陆板块的俯冲边界

D、大陆板块内部的生长边界

2、以下地貌单元中，成因与图所示机理相关的是[ ]

A、东非大裂谷

B、日本列岛

C、阿尔卑斯山脉

D、落基山脉

3、板块构造学说有助于人类进一步认识：①海陆间水循环的机理、②洋流分布和运动规律、③地震分布和活动规律、④矿产资源的分布规律 [ ]

A、①②

B、②③

C、③④

D、①④

第二节：完形填空（共20小题，每小题1.5分，满分30分）

BRITISH newspapers are among the oldest and most famous in the world. But recently big changes have   36   these traditional publications try to  37  the modern world. After 216 years, The Times has halved its   38   to become much smaller. In fact, the paper has  39  its size in half from a broadsheet to tabloid（小型报纸）.

In Britain the newspaper market is  40  between the larger broadsheets and the smaller tabloids. These terms  41  the size of the papers' pages but there is also a clear  42  in content. Broadsheets such as The Times, the Guardian and Daily Telegraph are  43  papers. They  44  a broad range of political, economic and international issues. Their stories are also  45  long and use quite formal language.

Tabloids have  46  more stories about less serious issues such as celebrities' love lives. Their stories are shorter and use more  47  language. Tabloids often have bigger pictures. Britain's  48  newspaper, the Sun, is a tabloid and has a naked page on page three every day.

By  49  to the size of a tabloid, The Times is following in the  50  of a less famous broadsheet paper, the Independent. It changed to tabloid last year and saw its sales increase  51 . Although both papers have   52   to the smaller size, the content of the papers has  53  the same. They are both still serious papers.

The two papers  54  that people find the smaller size easier to  55  when they travel to work on the bus or the train in the morning. The times says its new size is "compact", not tabloid.

36. A. found                   B. known                C. seen                   D. proved

37. A. match                    B. suit                     C. change                D. fit

38. A. length                       B. thickness             C. width                         D. size

39. A. printed                 B. cut                        C. added                       D. enlarged

40. A. divided                  B. separated                  C. arranged                D. marked

41. A. turn into                 B. think about               C. refer to                    D. connect with

42. A. meaning                  B. difference             C. mark                        D. sign

43. A. useful                        B. easy                    C. serious                  D. long

44. A. sell                       B. include                    C. take                      D. cover 

45. A. certainly             B. reasonably                      C. probably                D. necessarily

46. A. a few                        B. little                        C. far                           D. any

47. A. difficult                        B. simple                 C. easy                        D. good

48. A. best-selling                B. good-looking            C. slow-moving            D. ugly-looking

49. A. going                    B. getting                   C. coming                    D. changing

50. A. footsteps                       B. way                    C. direction                  D. method

51. A. slowly                    B. usually                    C. little                    D. greatly

52. A. halved                    B. made                   C. changed                 D. cut

53. A. become                   B. remained              C. left                   D. found

54. A. agree                     B. hope                    C. expect                 D. insist

55. A. handle                       B. look                         C. see                           D. buy

如图所示，传送带与水平地面间的夹角θ=37°，传送带上端A至下端B的长度l=16m．当传送带不转动时，在A处轻轻放上一个质量m=0.5kg的物块，它能沿传送带向下做匀加速直线运动．物块与传送带之间的动摩擦因数μ=0.5．取g=10m/s²．sin37°=0.6，cos37°=0.8．

（1）若传送带以u=10m/s的速率顺时针转动，求物块运动的加速度大小；

（2）若传送带以u=10m/s的速率顺时针转动，求物块从A运动到B所需的时间；

（3）若传送带以u=10m/s的速率逆时针转动，求物块从A运动到B所需的时间．

提取咖啡因可采用

A．浸渍法

B．水蒸气蒸馏法

C．升华法

D．盐析法

E．透析法

召开业主大会会议，应当于会议召开（）前通知全体业主。

A.5日

B.一周

C.10日

D.15日