问题 填空题

用天平测一杯水的质量,空杯放左盘,天平平衡时,右盘内砝码有50g、20g、10g各一个,2g 2个,游码示数0.6g.倒人水后,在右盘增加100g、20g 砝码各一个,游码示数0.8g.则杯子的质量是______g,水的质量是______g.

答案

天平读数时,物体的质量应是右盘中砝码的总质量和游码所指示数的值的和;

只放玻璃杯时,玻璃杯的质量为:50g+20g+10g+2g+2g+0.6g=84.6g,

由于此时天平平衡,向玻璃杯中倒入水后,水的质量正好和右盘中增加的砝码及游码增加的质量相同,即:100g+20g+(0.8g-0.6g)=120.2g;

故答案为:84.6;120.2.

阅读理解

阅读理解。

     Jee Hock and Meng Kim were very good friends. Jee Hock could not see. He was blind. Meng Kim could

not walk. He was lame. They lived in a village near a forest. Everyone in the village was going to a rich man's

dinner on the other side of the forest. Jee Hock and Meng Kim were anxious to attend the dinner too.

     Blind Jee Hock thought of a plan. He would carry Meng Kim. The lame man could tell him the way. Meng

Kim said that the plan was a good one.

     On the way through the forest, Meng Kim saw a tiger. He did not tell Jee Hock about is. Instead, he quietly

asked Jee Hock to carry him to the mearest tree. Upon reaching an over banging branch, Meng Kim quickly

hauled himself up.

     Then the tiger roared. Jee Hock at once knew a tiger was near. He lay down quietly. The tiger came to him

and sniffed his body. The tiger's whiskers touched Jee Hock's nose. At once Jee Hock sneezed,

"Ah choooooo!"The tiger was afraid and ran away.

     Then Meng Kim came down from the tree. He asked Jee Hock about the tiger. Jee Hock said that the tiger

had told him to choose his friends wisely.

1. Jee Hock and Meng Kim were good _____.

A. men

B. tigers

C. friends

D. brothers

2. They decided to go to _____.

A. a picnic

B. a dinner

C. a party

D. the cinema

3. When Meng Kim saw the tiger, he _____.

A. shouted loudly

B. did not tell Jee Hock about it

C. quickly climbed up a tree

D. lay down quietly

4. Jee Hock knew the tiger was near. He ______.

A. went to sleep

B. cried

C. sat down and waited

D. lay down quietly

5. Jee Hock sneezed because the tiger's whiskers _____.

A. hurt him

B. was very long

C. cut his nose

D. touched his nose

单项选择题