问题 解答题

某小组同学做了探究叶绿素的形成是否与光有关的实验,若你是其中的一员,请将实验过程填写完整.

(1)提出问题:

(2)作出假设:

(3)制定并实施计划:

(4)得出结论:

答案

科学探究的一般过程包括:提出问题、作出假设、制定计划、实施计划、得出结论和表达交流.

(1)题探究的是叶绿素的形成是否与光有关,因而提出的问题应该是:叶绿素的形成与光有关吗?

(2)做出的假设是依据问题做出的,假设的做出又与我们对结果的基本预测有着密切关系.根据我们的生活经验:在蒜黄是在遮光的条件下形成的,蒜苗是在有光的条件下形成的.因而做出的假设应是:叶绿素的形成与光有关.

(3)设计对照实验时,要坚持变量唯一的原则.此处我们探究的是叶绿素的形成是否与光有关,因而实验的变量应是光,所以我们可以这样设计实验:把两盆生长发育一样的蒜黄,一盆(甲)用黑色塑料袋罩住,另一盆(乙)不罩,同时放到温暖有光的地方几天后,去掉塑料袋,观察现象.

(4)根据经验该实验的现象:甲仍为黄色,乙为绿色.因而得出的结论是叶绿素的形成与光有关.

故答案为:(1)叶绿素的形成与光有关吗?

(2)叶绿素的形成与光有关

(3)把两盆生长发育一样的蒜黄,一盆(甲)用黑色塑料袋罩住,另一盆(乙)不罩,同时放到温暖有光的地方几天后,去掉塑料袋,观察发现甲仍为黄色,乙为绿色.

(4)叶绿素的形成与光有关.

完形填空

SECTION B (18 points)

Directions:For each blank in the following passage there are four words or phrases marked with A, B, C and D. Fill in each blank with the words or phrases that best fits the context.

People have always enjoyed laughing, and there has always been humor. One of the most well-known and well-loved types of comedy is called   36 . Stand-up comedy is special   37   the comedian is right there in front of the audience and may talk directly to audience members. A stand-up comedian may make fun of an audience member, or he or she might decide to tell different jokes   38  the reactions of an audience.

There are different styles of stand-up comedy. The main four are observational(观察评论类), prop(道具使用类), physical(形体动作类) and impressionist(印象模仿类) . In observational comedy, the comedian makes jokes about humorous things he or she    39   in everyday life. If you hear a comedian telling jokes about the way   40   people behave when they queue up in lines, or asking why it only rains when you forget your   41 , you are listening to an observational comedian. Prop comedians use things, called   42 , to tell their jokes. The jokes are not funny if you cannot see the prop. It is a type of visual humor. If a comedian points to a   43   tennis game and says, “I’ve been playing tennis   44  for a month. I don’t understand why I am not losing   45 !”, he or she is using the computer as a prop. Physical comedians use their bodies to make jokes. They have been   46  chairs, walking into doors, and falling down on stage for years. The last style is called   47 . These comedians act or speak like a well-known person. This is called doing an impression of the person.

36. A. prop           B. comedy       C. stand-up            D. comedian

37. A. because of               B. because         C. although          D. as if

38. A. in honor of         B. in order to     C. in case of           D. in response to

39. A. watch           B. observe        C. see                D. find

40. A. /                   B. in that          C. how               D. which

41. A. coat                B. wallet          C. umbrella           D. sunglasses

42. A. queues            B. humor        C. impression        D. props

43. A. funny           B. boring        C. computer                D. new

44. A. every day       B. everyday      C. some times        D. sometimes

45. A. weigh         B. weight          C. overweight         D. weight-loss

46. A. running after          B. fighting against C. competing with      D. tripping over

47. A. impressionist      B. prop               C. physical            D. observational

判断题