(做数字加减游戏.复习数词11-20.) T: Now let’s play two number games. Example: T: Take a number. S1: Two. T: And ten.(可用手势帮助学生理解.) S1: Twelve. T: Plus eight. S1: Twenty. T: Minus fifteen. (可用手势帮助学生理解.) S1: Five. (游戏分两组.进行小组竞赛.算得又快又准确的组为获胜组.) Step 4 Practice 第四步 练习 查看更多

 

题目列表(包括答案和解析)

小刚家准备建一栋新房,爸爸买了一堆材料相同的石子,小刚选取一块石子在实验室测它的密度.
他先将托盘天平放在水平桌面上,调节托盘天平平衡时,发现指针停在分度盘的右侧,要使天平平衡,应将横梁右端的平衡螺母向   (左/右)移动;当他用天平测物体质量时,发现指针偏向分度盘的左侧,这时应该在天平右盘中      (增加/减少)砝码;
测小石子的密度,主要实验步骤是: A.用量筒测出小矿石的体积;B.将小矿石从水中取出,立即放在已调节平衡的天平盘上,加减砝码和调节游码,测出小矿石的质量;C.再用密度计算公式求出小石子的密度.请你评估:这一实验过程测算出的密度结果______(选填“偏大”、 “偏小”或“准确”),原因是_______________________.

刚按图甲所示的方法测石子的质量,请指出操作中的三个错误:
                                                      
                                                      
                                                      
纠正错误后继续实验,当盘中所加砝码和游码位置如图19乙所示时天平平衡,则此石子的质量为      g.在量筒内装有一定量的水,该石子放入前、后的情况如图19丙所示,则石子的体积是       cm3,此石子的密度是           kg/m3

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小刚家准备建一栋新房,爸爸买了一堆材料相同的石子,小刚选取一块石子在实验室测它的密度.
他先将托盘天平放在水平桌面上,调节托盘天平平衡时,发现指针停在分度盘的右侧,要使天平平衡,应将横梁右端的平衡螺母向   (左/右)移动;当他用天平测物体质量时,发现指针偏向分度盘的左侧,这时应该在天平右盘中      (增加/减少)砝码;
测小石子的密度,主要实验步骤是: A.用量筒测出小矿石的体积;B.将小矿石从水中取出,立即放在已调节平衡的天平盘上,加减砝码和调节游码,测出小矿石的质量;C.再用密度计算公式求出小石子的密度.请你评估:这一实验过程测算出的密度结果______(选填“偏大”、 “偏小”或“准确”),原因是_______________________.

刚按图甲所示的方法测石子的质量,请指出操作中的三个错误:
                                                      
                                                      
                                                      
纠正错误后继续实验,当盘中所加砝码和游码位置如图19乙所示时天平平衡,则此石子的质量为      g.在量筒内装有一定量的水,该石子放入前、后的情况如图19丙所示,则石子的体积是       cm3,此石子的密度是           kg/m3

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My grandfather is eighty years old now. He always complains about how fast things have changed, and he often says that life used to be better.

?? Families aren’t families they used to be. A lot of families have broken up. If husband and wife have problems with their marriage, they no longer stay together. And mothers used to stay at home and take care of their children, but now not any more. Everyone is busy working. Mother used to spend all day cooking in the kitchen. But now the family dont eat home-cooked food any more.

?? And the cars! No one walks any more. More and more people drive. Students used to walk 5 miles to school every day, even in winter. But nowadays students don’t. And in school, children don’t have to think any more.. In math class, for example, they used to add, subtract, multiply and divide(加减乘除)in their heads. Instead, they use calculators.

?? And people today have TV and computers, and they don’t talk to each other any more. They are too busy to talk, too busy to eat, too busy to think.

?? Life used to be simple, but it isn’t any more.

1.What does my grandfather think of the life now?

A. He thinks the life now is very good.??

B. He thinks the life now is worse than it used to be.

C. He thinks the life now is better than it used to be.

D. He thinks the life is the same as it used to be.

2.What does the underlined word “marriage” mean in Chinese?

A. 生活??????? B.工作?????? C.婚姻?????? D.家庭

3.What has happened these years according to the passage?

A. Children don’t have to think any more in school.

B. Students use calculators in math class.

C. Some used to walk to school, but now they don’t.?

D. All of above.

4.What changes have happened to some families?

a. People have TV.??

b. People like to eat home-cooked food.

c. Lots of families have computers.

d. Lots of couples(夫妇)live apart because of unhappy problems.

A. a, b, d????????? B. b, c, d??????? C. a, b, c????? D. a, c, d

5.Which is TRUE according to the passage?

A. Life now is much simpler.?

B. People have too much time to talk with each other now.

C. The writer’s grandfather only complains and pays no attention to better life now.

D. Lots of mothers stay at home and look after their children.

 

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小刚家准备建一栋新房,爸爸买了一堆材料相同的石子,小刚选取一块石子在实验室测它的密度.
他先将托盘天平放在水平桌面上,调节托盘天平平衡时,发现指针停在分度盘的右侧,要使天平平衡,应将横梁右端的平衡螺母向   (左/右)移动;当他用天平测物体质量时,发现指针偏向分度盘的左侧,这时应该在天平右盘中      (增加/减少)砝码;
测小石子的密度,主要实验步骤是: A.用量筒测出小矿石的体积;B.将小矿石从水中取出,立即放在已调节平衡的天平盘上,加减砝码和调节游码,测出小矿石的质量;C.再用密度计算公式求出小石子的密度.请你评估:这一实验过程测算出的密度结果______(选填“偏大”、 “偏小”或“准确”),原因是_______________________.

刚按图甲所示的方法测石子的质量,请指出操作中的三个错误:
                                                      
                                                      
                                                      
纠正错误后继续实验,当盘中所加砝码和游码位置如图19乙所示时天平平衡,则此石子的质量为      g.在量筒内装有一定量的水,该石子放入前、后的情况如图19丙所示,则石子的体积是       cm3,此石子的密度是           kg/m3

查看答案和解析>>

小刚家准备建一栋新房,爸爸买了一堆材料相同的石子,小刚选取一块石子在实验室测它的密度.
他先将托盘天平放在水平桌面上,调节托盘天平平衡时,发现指针停在分度盘的右侧,要使天平平衡,应将横梁右端的平衡螺母向   (左/右)移动;当他用天平测物体质量时,发现指针偏向分度盘的左侧,这时应该在天平右盘中      (增加/减少)砝码;
测小石子的密度,主要实验步骤是: A.用量筒测出小矿石的体积;B.将小矿石从水中取出,立即放在已调节平衡的天平盘上,加减砝码和调节游码,测出小矿石的质量;C.再用密度计算公式求出小石子的密度.请你评估:这一实验过程测算出的密度结果______(选填“偏大”、 “偏小”或“准确”),原因是_______________________.

刚按图甲所示的方法测石子的质量,请指出操作中的三个错误:
                                                      
                                                      
                                                      
纠正错误后继续实验,当盘中所加砝码和游码位置如图19乙所示时天平平衡,则此石子的质量为      g.在量筒内装有一定量的水,该石子放入前、后的情况如图19丙所示,则石子的体积是       cm3,此石子的密度是           kg/m3

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