练习册

  • 练习册
  • 试题
    C 15. A 16. A 17.B 18.C 19.A 20.A 21.D 22.C 【查看更多】

     

    题目列表(包括答案和解析)

    一个池塘养了某种鱼5万条，从中捕捞了20条，称得它们的质量如下(单位：kg)：

    1.16，1.15，1.21，1.11，1.08，1.36，1.25，1.18，1.14，1.21，1.19，1.14，1.09，1.25，1.22，1.29，1.16，1.23，1.12，1.17．

    (1)计算这20条鱼的平均质量；

    (2)根据计算结果估计一下池塘中所有这种鱼的总质量．

    查看答案和解析>>

    13、下列各等式呈现某种规律，根据规律直接写出第4个等式为
    16+17+18+19+20=21+22+23+24
    ．
    1+2=3；
    4+5+6=7+8；
    9+10+11+12=13+14+15…

    查看答案和解析>>

    完形填空 （20分）
    The famous British inventor George Stephenson was born in 1781 and died in 1848. one of his _21_ important inventions was the train. He _22_his first train when he was forty-four years old. When he was experimenting with the _23_ engine on the train, he met with _24_ from the government, newspapers and the gentlemen in the country. They said that the noise and the smoke would _25_ cows, horses and sheep, that the _26_ would hurtle(炸飞) or that the hot coals from it would _27_their houses. At that time, _28_ people believed what they said.
    George Stephenson _29_ the people that the train could go on small _30_, could pull carriages _31_goods and passengers and there was _32_ to them. It was a very _33_ matter for him to _34_ them believe. However, after _35_, he was able to do it; and the first train that _36_ by Stephenson himself _37_ what he had said.
    The first day _38_ the people along the way _39_ the noises of the train _40_ and saw it running quickly to them, they ran back home as quickly as they could and closed their doors tightly, for they thought it a genius. They did not dare to come out until it had passed.
    【小题1】
    A．veryB．a lotC．mostD．much
    【小题2】made   B. bought   C. introduced   D. did
    【小题3】
    A．electricalB．atomicC．steamD．beautiful
    【小题4】
    A．successB．troublesC．peopleD．pleasure
    【小题5】
    A．killB．buyC．interestD．take away
    【小题6】
    A．smokeB．noiseC．driverD．engine
    【小题7】
    A．pull downB．blow awayC．set fire toD．pass
    【小题8】
    A．mostB．fewC．only a fewD．the rich
    【小题9】
    A．saidB．spokeC．toldD．warned
    【小题10】 A.reads    B. rivers    C. steam    D rails
    【小题11】
    A．short ofB．full ofC．empty ofD．without
    【小题12】
    A．no great dangerB．dangerousC．a lot of dangerD．few danger
    【小题13】
    A．easyB．difficultC．pleasantD．light
    【小题14】
    A．getB．causeC．makeD．force
    【小题15】
    A．sometimesB．some timeC．a few timesD．sometime
    【小题16】
    A．was soldB．were drivenC．was pulledD．was driven
    【小题17】
    A．believedB．seemedC．sensedD．proved
    【小题18】
    A．ofB．whenC．whileD．for
    【小题19】
    A．caught sight ofB．listened toC．heardD．thought
    【小题20】
    A．nearbyB．in the distanceC．on the farD．from the distance

    查看答案和解析>>

    下面是某月份日历：
    日 一 二 三 四 五 六
    1 2 3 4 5
    6 7 8 9 10 11 12
    13 14 15 16 17 18 19
    20 21 22 23 24 25 26
    27 28 29 30
    （1）求第1列日期之和是多少？在这四个数前添加“+”号或“-”后，能使它们之和为0吗？若能，请写出算式．
    （2）在第3列的数前添加“+”号或“-”号后，也能使它们的和为0吗？若能，请写出算式；若不能，列式求出它们和的最小正数值．

    查看答案和解析>>

    下表为某月的月历。

    日

    一

    二

    三

    四

    五

    六

     

     

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    13

    14

    15

    16

    17

    18

    19

    20

    21

    22

    23

    24

    25

    26

    27

    28

    29

    30

    31

     

     

     

     

     

     

     

     

     

    （1）在此月历上用一个矩形任意圈出23个数，如果圈出的6个数之和为51，这6天分别是几号？

    （2）观察此月历，你还能提出其他的问题吗？

     

    查看答案和解析>>


    同步练习册答案