问题 探究题

小明和小华用下图所给器材做“探究物体浮沉条件”的实验。请在下面横线上填入相应正确内容。

(1)他们首先探究物体下沉的条件,过程如下:

A.将部分螺母放入塑料瓶中,旋紧瓶盖,浸没水中松手后,观察到小瓶下沉;

B.取出小瓶,________;

C.将小瓶挂在弹簧测力计下,见图(a),测出其重力为________N;

D.将小瓶浸没水中,弹簧测力计示数见图(b), 则小瓶受到的浮力为________N;

E.分析比较数据得出物体下沉的条件。

(2)他们接着探究物体上浮的条件,过程如下:

A.取出小瓶,________;

B.用弹簧测力计测出小瓶的重力;

C.将小瓶浸没水中松手后,观察到小瓶上浮,在小瓶露出水面前,它受到的浮力为________N,依据是:________;

D.分析比较数据得出物体上浮的条件。  

答案

(1)用抹布擦干瓶的外壁;2.4;0.6

(2)倒出螺母,并用抹布擦干瓶的外壁;0.6;小瓶排开水的体积不变,因此所受的浮力不变

填空题
完形填空

第二节:完形填空(共20小题,每小题1.5分,满分30分)

阅读下面短文,掌握其大意,然后从36—55各题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

The story of how I got my job was a funny one .

One day , I was  36  along a street to the interview  37  a yellow car suddenly cut in front of me .  38  another car coming in the other  39  , I had to brake hard and  40  another cyclist . We both fell , but  41  neither of us was hurt . I became angry and cycled as fast as possible to the driver of the yellow car to tell him  42  I considered him . I told him what a bad  43  I thought he was and he was a(n)  44  to other people on the road . His face turned  45  . I warned him not to drive  46  in the future so that everyone else could enjoy a long life .

I was in time for the  47  . Having walked into the room , to my  48  , I found one of the three interviewers  49  to be the driver of the yellow car . We looked at each other for a while ,  50  silent . Then I decided to look  51  the whole matter as a great joke !

I laughed and told him that I talked  52  the last time we met and this time it was turn for him to talk a great deal .

Lost in thought for a while , he  53  that I was not going to say anything about his bad driving . The interview went  54  . Two days later , I received a letter offering me the job . I was pleased that the manager—the driver of the yellow car , didn’t  55  my rudeness to him .

Through the experience , I find something that seems impossible at first sometimes turns out to be good .

36.   A.      cycling                B.    walking              C.   running              D.    driving

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

38.    A.      As                       B.    For                     C.   With                  D.    By

39.    A.      condition             B.    position              C.   location              D.    direction

40.    A.      knocked               B.    bumped              C.   beat                   D.    rushed

41.    A.      happily                B.    unfortunately       C.   luckily               D. disappointedly

42.    A.      which                  B.    that                    C.   what                  D.    how

43.    A.      driver                  B.    worker                C.   cyclist                D.    boss

44.    A.      pity                     B.    idiot                   C.   risk                    D.    fool

45.    A.      black                   B.    white                  C.   pale                   D.    red

46.   A.      carelessly             B.    carefully             C.   slowly                D.    patiently

47.    A.      job                      B.    interview            C.   meeting              D.    appointment

48.    A.      excitement           B.    joy                     C.   anger                 D.    astonishment

49.    A.      happened             B.    wanted                C.   seemed               D.    planned

50.    A.      making                B.    keeping               C.   breaking             D.    stopping

51.   A.      up                       B.    at                       C.   on                     D.    into

52.    A.      much                   B.    little                   C.   more                  D.    less

53.    A.      hoped                  B.    found                 C.   heard                 D.    wished

54.    A.      fast                     B.    terribly               C.   well                   D.    slowly

55.    A.      realize                 B.    want                   C.   know                 D.    mind