题目

 现有一瓶某品牌的饮用纯净水。 （1）瓶盖上刻有一道道竖直的条纹，其目的是______摩擦（填“增大”或“减少”）。 （2）用手握住水瓶在空中静止不动，此时水瓶受到的______和手对瓶的摩擦力是平衡力。 答案： 增大            重力“Hurry up, Chris,” my dad said in a low voice. “He’s gonna get away. You need to   36  him now.” I was pointing my   37  at a duck. It was a(n)   38  day for me. Shooting those ducks would make my father   39  , but I just couldn’t. My father   40  fishing and hunting ducks. I thought fishing was boring,   41  Dad hardly ever asked me to go with him. I had gone hunting with Dad before but   42  brought a gun, because I didn’t own one, and his were too big for me. The gun was a present for my birthday. I’d been   43  almost every evening. I   44  I could hit that duck, but I didn’t want to. I had never   45  killing things, and I hated people who killed animals for no reason at all. I liked   46  . I didn’t want to hurt it. I pointed the gun at the duck. He was trying hard to find food and had to keep a careful eye on his   47  at the same time, and now my dad asked me to kill him so we could have one nice   48  . I hated myself for   49  pointing the gun at the duck, but I hated to   50  my father’s feelings too. “I… I can’t tell which is the duck,” I explained. “Just try, Chris. I know you can do it,” Dad   51  me. “Thanks, Dad.” I   52  to myself. “Your words just make it harder for me.” My eyes filled with tears as my brain had made a(n)   53  —I wouldn’t shoot the duck. “You really don’t want to shoot him, do you?” Dad quietly cut in on my   54  . I was too choked (哽咽的) to say anything.   55  , a nod was enough. 36. A. stop B.shoot C.follow D. cover 37. A. camera B. finger C. knife D. gun 38. A. difficult B. exciting C. special D. busy 39. A. angry B. fresh C. proud D. sad 40. A. started B. allowed C. tried D. loved 41. A. but B. so C. and  D. for 42. A. never B. seldom C. sometimes D. ever 43. A. watching   B. working  C. practicing D. performing 44. A. knew B. explained C. realized D. imagined 45. A. hated B. enjoyed C. seen    D. missed 46. A. success  B. truth C. nature D. peace 47. A. children B. behavior C. weight D. enemies 48. A. dream B. idea C. meal D. day 49. A. even B. still C. again D. almost 50. A. share B. hurt C. hide D. consider 51. A. persuaded B. warned C. reminded D. encouraged 52. A. listened B. promised C. cried D. lied 53. A. decision B. difference C. effort D. mistake 54. A. time B. thought  C. action D. plan 55. A. Sadly B. Quickly C. Suddenly D. Luckily