树脂的交联度大，其网孔就小，则其颗粒内扩散就慢。所以交联度大的树脂，交换速度一般偏向

Which country is            , Russia or America?[ ]

A. big

B. bigger

C. more bigger

D. much big

完形填空。阅读下面短文，从自短文后所给的四个选项（A、B、C和D）中选出能填入空白处的最佳选项。（每小题1.5分，满分30分）

It had been a tiring day and I was looking forward to__31__ evening. My husband__32__ back until late and I had __33___ to sit down in a comfortable armchair in the living room and read a book. I __34__  the children to bed early and __35__ a cold supper and some coffee. Soon I was sitting comfortably with a plate __36___ with food before me and a book at my side.

I was just beginning to eat __37__ the telephone rang. I put down my knife and fork and hurried to answer __38___ . By the time I got back to the living room，my coffee __39__ cold.  After I finished my __40__ I began to drink my coffee __41__ my book open at page one.  Suddenly there was a __42__ at the door. It gave me __43__ surprise that I spilt the __44__ and made an ugly stain（污迹）on my skirt.  Some stranger had got __45__ and wanted me to show him the way. It __46__   ages to get rid of him. At last I __47__ to sit down again __48__ actually read a whole page without __49__ more interruption until the baby woke up. He began crying loudly and I rushed up-stairs. The baby was __50__ awake at eleven o'clock when my husband came home. I should have cried myself when he asked me if I had a pleasant evening！

31. A. a quiet                   B. an exciting           C. a lovely          D. a lonely

32. A. would come                B. had not come        C. came         D. would not come

33. A. decided                   B. started             C. come            D. hurried

34. A. put                      B. made             C. threw            D. allowed

35. A. boiled                     B. heated                     C. cooked           D. prepared

36. A. full                 B. filled                 C. filling               D. to be filled

37. A. as                        B. then               C. when             D. while

38. A. him                       B. her                C. it                 D. them

39. A. was getting          B. had got           C. would get          D. got

40. A. supper            B. drinking               C. reading            D. coffee

41. A. while                      B. when             C. as                D. with

42. A. stranger                 B. loud knock          C. dog               D. man

43. A. such great                B. a so great          C. such a great        D. so great

44. A. food                       B. supper            C. plate              D. coffee

45. A. gone                      B. lost               C. missing             D. away

46. A. cost                      B. spent             C. paid               D. took

47. A. tried                      B. hoped             C. decided             D. managed

48. A. before                    B. after              C. but                D. and

49. A. some                     B. any               C. much              D. no

50. A. already                    B. still               C. possibly            D. almost

由于不同节目源（甚至电视台节目的每一个频道）（）和（）多少有些不同，所以适量的过扫描是必须的。

电路如图所示，已知电阻R均为1Ω，则电压表读数应为（）。

A.0V

B.5V

C.10V

D.1V

啤酒花的主根发达，入土深入达到4米以上，从主根基部长出的侧根有6~10条，向四周扩展2~3米，主要根系分布在50~80厘米土层内，主根部分特别肥大，是（）的主要部位。

A、贮藏养分

B、消耗养分

C、发展根系

D、增产增收