问题 计算题

甲、乙、丙三物体同时同地出发做直线运动,运动情况如图所示。

(1)试分析在20 s时间内三个物体的运动情况。

(2)甲物体运动的路程是多少?

(3)丙物体的平均速度大小是多少?

答案

解:(1)由题意知三物体均做直线运动,区别在于:乙做匀速直线运动,甲做速度先减小后增大的往返的直线运动,丙做速度不断增大的单向直线运动

(2)甲物体先向位移正方向运动,通过的路程为100m,后向位移负方向运动,运动路程20m,所以甲总路程为120m

(2)丙物体的平均速度:

多项选择题
[ ]

A.欣赏他人,发现别人的长处,虚心向别人学习

B.对竞争对手心存怨恨

C.理解和谅解别人,化解分歧和误会

D.换位思考,以诚相待,共同发展

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完形填空

第二节完形填空(20小题;每小题1.5分,满分30分)

On a hike through the bush, he came across a young bull elephant standing with one leg raised in the air. The elephant   36   distressed(痛苦的), so Peter approached it very   37  .

He got down on one knee, examined the elephant's   38   and found a large piece of wood deeply embedded(刺入)in   39  . As carefully and as gently as he   40  , Peter worked the wood out with his hunting knife,   41   which the elephant gingerly put down its foot. The elephant   42   to face the man, and with a rather curious look on its face,   43   at him for several tense moments. Peter stood   44  , thinking of nothing else but being killed.   45  the elephant trumpeted(高声鸣叫)loudly, turned, and walked away. Peter never forgot that elephant or the events of that day.

Twenty years   46  , Peter was walking through the Chicago Zoo with his teenaged son. As  47    approached the elephant enclosure(围栏), one of the creatures turned and walked over to near   48   Peter and his son Cameron were   49  . The large bull elephant stared at Peter, lifted its front foot off the   50  , then put it down. The elephant  did that several times then trumpeted loudly,   51   staring at the man.

Remembering the accidental meeting in 1986, Peter could not help   52   if this was the same elephant. Peter   53   his courage, climbed over the  railing, and made his way into the enclosure. He walked   54   up to  the elephant and stared back in wonder. The elephant   55   again, wrapped its trunk around one of Peter's legs and threw this stupid ass hard against the railing, killing him immediately.

Probably it wasn't the same elephant.

36.A.appeared      B.proved        C.seemed        D.remained

37.A.quickly        B.carelessly           C.carefully      D.pitifully

38.A.foot      B.body           C.tail       D.head

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

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

41.A.after     B.before         C.with     D.on

42.A.rushed   B.turned         C.walked        D.stepped

43.A.stared    B.watched      C.noticed        D.glanced

44.A.quiet     B.silent          C.frozen         D.sad

45.A.Slowly         B.Highly        C.Lowly         D.Finally

46.A.later      B.after           C.ago      D.late

47.A.Peter     B.Cameron     C.they     D.visitors

48.A.where   B.when          C.what     D.that

49.A.sightseeing   B.visiting       C.walking       D.standing

50.A.floor     B.ground        C.earth    D.land

51.A.all at once    B.all the while     C.all the same     D.all of a sudden

52.A.realizing       B.feeling        C.sensing        D.wondering

53.A.gathered       B.called         C.took     D.kept

54.A.round    B.direct          C.about    D.right

55.A.shouted        B.cried           C.whispered    D.Trumpeted