问题 填空题

(10日照25)右图是甲、乙两种固体物质的溶解度曲线。请回答:甲物质在45℃时的溶解度为_______;甲、乙两物质的溶解度相等时的温度是____℃;要使甲的不饱和溶液变为饱和溶液应_____________(填“升高”、“降低”)温度;常压下,CO2在水中的溶解度随温度的变化应类似于____(填“甲”、“乙”)曲线。

答案

50 g   25  降低  乙

题目分析:由溶解度曲线图可知,甲物质在45℃时的溶解度为 50克,曲线的交点,表示该温度下,两种物质的溶解度相同,所以,甲、乙两物质的溶解度相等的温度是,25℃,溶解度曲线向上倾斜,表示该物质的溶解度随温度的升高而增大,向下倾斜,表示该物质的溶解度随温度的升高而减小,所以要使甲的不饱和溶液变为饱和溶液应降低温度,气体的溶解度受温度影响为,随温度的升高而减小,所以CO2在水中的溶解度随温度的变化应类似于乙。

点评:根据溶解度曲线图象上的点的意义,和曲线的徒度变化情况可以知道,在某温度下的溶解度和该物质的溶解度受温度的影响变化情况,锻炼了学生分析问题和整合知识的能力。

选择题
阅读理解

阅读理解。

     Scholars and researchers have tried to discover what personality characteristics go along with success in

intercultural experiences. Their findings have often been unclear or incomplete. But three characteristics stand

out in their reports: patience, a sense of humor, and the awareness of being unclear.

     Patience, of course, is the ability to keep calm even when things do not go as one wants them to, or hopes

they will, or has even been sure they will. Impatience sometimes brings improvements in relations with other

people, but usually it does not.

     A person with a sense of humor is less likely to take things too seriously and more ready to see the humor

in her own reactions than a humorless person. The value of a sense of humor really needs to be paid more

attention to.

     "The awareness of being unclear" is a more difficult concept than patience or a sense of humor. Foreigners

often find themselves in situations that are unclear to the newcomers. That is, they do not know what is

happening in the situation. Perhaps they do not understand the local language well enough, or they do not know

how some system or organization works, or they can't be sure of different people's roles in what is going on.

"It's like I just got here from the moon," a Chinese graduate student who newly arrived in the United States said,

"things are just so different here."

1. The passage mainly tells us _____. [ ]

A. that it's not easy to travel abroad

B. that humor is very important in communication

C. about some characteristics in dealing with foreigners

D. about three main ways useful for communicating with foreigners

2. According to the passage, what characteristic should be most focused on? [ ]

A. Patience

B. The awareness of being unclear

C. The sense of humor

D. Understanding each other.

3. "The awareness of being unclear" refers to _____.[ ]

A. knowing the meaning of an exact situation

B. not stating clearly what happens

C. realizing the possible misunderstanding in a situation

D. being aware of the unclear situation

4. According to the writer, the Chinese students is _____.

A. a hard-working student

B. recently back from the moon

C. interested in the study of moon

D. not used to the culture in America