问题 填空题

(5分)根据A物质和B物质的溶解度曲线,回答下列问题:

(1)20℃时,将35g A物质和35g B物质分别放入盛有100g水的烧杯中,充分搅拌,溶液达到饱和的是  (填“A”或“B”)。

(2)溶解度曲线A与B的交点P的含义是                                    

(3)C物质的溶解度如下表,请在上图中描出C物质的溶解度曲线。

温度/℃0102030405060
溶解度/g40332723181410

答案

(1)A      (2)30℃时,AB两物质的溶解度相等     (3)图略

题目分析:(1)从溶解度曲线图可看出:在20℃时,A的溶解度大约为33g,B的溶解度为40g,所以20℃时,将35g A物质和35g B物质分别放入盛有100g水的烧杯中,充分搅拌,溶液达到饱和的是A

(2)溶解度曲线A与B的交点P的含义是:30℃时,AB两物质的溶解度相等

(3)根据数学里学国的知识,先描点,再连线

阅读理解

阅读理解

     Einstein was born in Germany in 1879. In his early childhood he was slow to learn to talk and didn't seem to be

very bright. But by the time he was fourteen years old, he had taught himself advanced math from text books. By

then he knew what he wanted to be when he grew up. He wanted to be a physicist in the future.

     The Einsteins didn't have so much money to pay for the advanced education that young Albert needed. But the

family tried their best to send him to a technical school and later to the university in Switzerland. After graduation,

he went to work, first a teacher, then in a government(政府) office. With the pay that he received he was able to

go on with his schooling at the University of Zurich, where he received a doctor's degree in 1905. This was the

first time when he first began the research and studies which led to his famous Theory of Relativity.

     As time went on, Einstein's theory proved to be correct and by 1914 he had become one of the most famous men

in the world. His work was stopped by the First World War. The war made him quite sad. He lost interest in much of

his research. Only when the war was over in 1918 was he able to get happily back to work. He won the Nobel Prize

for physics in 1921.

     In 1940, Einstein became an American citizen. He lived the rest of his life in the United States. Besides(除......之外)

his work in physics, he spent much time working for human rights( * * ) and progress. He died in the United States in

1955.

1. He wanted to be a physicist ________.

A. when he got to America

B. when he was fourteen

C. in 1889

D. in 1879

2. Einstein went to work ________.

A. after he left the University of Zurich

B. after he went to a technical school

C. after he graduated from the university in Switzerland

D. when he was twenty years old

3. Einstein received a doctor's degree ________.

A. after he researched the Theory of Relativity

B. at the University Zurich

C. when he was 14 years old

D. after he won the Nobel Prize

4. How old was Einstein when he died?

A. Forty-two

B. Fifty-five

C. Seventy-nine

D. Seventy-six

5. Einstein's family was ________ when he was a child.

A. quite rich

B. rich

C. not rich

D. very poor

单项选择题