改变进入气缸的混合气数量来调节汽油机负荷，这种调节方式称为（）。

第二节：完形填空（共20小题；每小题1.5分,满30分）

阅读下面短文,从短文后所给各题的四个选项(A、B、C、D)中, 选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

Even though it was only October, my students were already whispering about Christmas plans. With each passing day everyone became more  31  , waiting for the final school bell. Upon its  32  everyone would run for their coats and go home, everyone except David.

David was a small boy in ragged clothes. I had often  33   what kind of home life David had, and what kind of mother could send her son to school dressed so  34  for the cold winter months, without a coat, boots, or gloves. But something made David 35 . I can still remember he was always  36  a smile and willing to help. He always  37  after school to straighten chairs and mop the floor. We never talked much. He  38  just simply smile and ask what else he could do, then thank me for letting him stay and slowly  39  home.

Weeks passed and the  40  over the coming Christmas grew into restlessness until the last day of  41  before the holiday break. I smiled in  42  as the last of them hurried out the door. Turning around I saw David  43  standing by my desk.

“I have something for you,” he said and  44  from behind his back a small box.  45  it to me, he said anxiously, “Open it.” I took the box from him, thanked him and slowly unwrapped it. I lifted the lid and to my  46  I saw nothing. I looked at David‘s smiling face add back into the box and said, “The box is nice, David, but it’s  47  .”

“Oh no, it isn’t,” said David. “It’s full of love. My mum told me before she died that love was something you couldn’t see or touch unless you know it’s there.”

Tears filled my eyes  48  I looked at the proud dirty face that I had rarely given  49  to. After that Christmas, David and I became good friends and I never forgot the meaning  50  the little empty box set on my desk.

31. A. anxious          B. courageous      C. serious      D. cautious

32. A. warning               B. ringing           C. calling      D. yelling

33. A. scolded          B. wondered        C. realized      D. learned

34. A. irregularly       B. unnaturally        C. untidily      D. improperly

35. A. popular          B. upset            C. special      D. funny

36. A. expressing        B. delivering        C. wearing          D. sharing

37. A. practiced          B. wandered        C. studied      D. stayed

38. A. would           B. should            C. might       D. could

39. A. aim at           B. turn to            C. put off      D. head for

40. A. argument         B. excitement         C. movement    D. judgment

41. A. school         B. year            C. education     D. program

42. A. relief                B. return             C. vain          D. control

43. A. weakly          B. sadly            C. quietly      D. helplessly

44. A. searched          B. found             C. raised       D. pulled

45. A. Holding               B. Handing         C. Sending           D. Leaving

46. A. delight          B. expectation        C. appreciation D. surprise 

47. A. cheap           B. empty            C. useless      D. improper

48. A. as              B. until            C. because      D. though

49. A. advice          B. support           C. attention      D. command

50. A. from            B. behind            C. over         D. towards

甲、乙共同签订了一份买卖合同，甲以本公司为收款人的汇票质押给乙公司，为此，双方订立了书面的质押合同，并交付了票据。乙公司按照买卖合同履行约定的事项，但甲未能按期交付货款。乙公司遂于该票据到期时持票据向承兑人提示付款。根据票据法律制度规定，下列表述中，正确的是( )。

A．承兑人应当向乙公司付款
B．如果乙公司同时提供了书面质押合同证明自己的权利，承兑人应当付款
C．如果甲公司书面证明票据质押的事实，承兑人应当付款
D．承兑人可以拒绝付款

大便先干后溏，多属

A．脾气虚弱

B．肝郁乘脾

C．命门火衰

D．湿盛伤脾

E．食滞肠胃

实现逆流再生的关键是防止交换剂层托起和乱层现象。（）