问题 选择题

物质M的溶解度曲线如图所示.下列说法正确的是(  )

A.M的溶解度随温度升高而增大

B.使用降温法可使M从饱和的水溶液中析出

C.在50℃与60℃之间.M在水中的溶解度大致相等

D.在10℃时,将30g物质M放入100g水中,充分搅拌后溶液质量为130g

答案

A、观察图示可知:M的溶解度随温度的升高而减小,故错误;

B、要使M从饱和的水溶液中析出,则应使M的溶解度减小,应该升高温度,故错误;

C、根据图示可知,50℃与60℃之间M的溶解度变化很小,大致相等,故正确;

D、10℃时M的溶解度为10g,溶解度是一定温度下,100g溶剂中溶解溶质达饱和状态时所溶解溶质的质量,由此可知,10℃时100g水中溶解10g的M即达到饱和状态,所以得到溶液的质量是110g,故错误.

故选C.

单项选择题
阅读理解

About seven years ago, whenever I notice someone looked nice, I started telling them they looked nice. Shortly afterwards, I came up with an observation: If you tell five people during the day that they look nice, at the end of the day, six people feel great. Here are some fruitful experiences I have with this.

One day, I was riding with a friend when we rolled to a stop at the traffic light. As we waited for the light to turn green, a man walked across the crosswalk. He looked very together, so I called out, “Hey, you look sharp today!” Pointing towards a building, he said, “Thanks, but I was sharper there.” His comment puzzled me. But before I could ask about it, the light turned green, and we drove on. I asked my friend what he meant. My friend informed me that we were at the corner of a radio station and the man was the voice on the radio. Then I understood. But no matter who he was the biggest thing for me was that he was smiling when he accepted my compliment (赞扬).

Later that day, there was a woman standing on the corner where we were turning, and I yelled (大喊) the compliment again, “You look nice!” She was just taking a sip of a bottle of water and started to laugh. I felt good to get a laugh.

Another day, while seated in a restaurant, there was a lady sitting near me. I really did not care for her skirt, but she did look nice in it, so I told her, “You look nice today.” She looked at me and rolled her eyes a little. Well, her friend sitting next to her told her, “He just gave you a compliment. Say thank you.” I don’t remember whether she said “thank you” or not, but what I did notice was that her friend was smiling at my “You look nice today” compliment.

小题1:The underlined word “sharp” in Paragraph 2 probably means_________.

A.attractive

B.sudden

C.strict

D.mild小题2:Which of the following statements is NOT true according to the passage?

A.The first man the author praised accepted his compliment.

B.The first man the author praised worked at a radio station.

C.The woman standing on the corner didn’t like the compliment

D.The friend of the lady in the restaurant felt happy about the compliment.小题3:What would be the best title of the passage?

A.Fruitful Experiences

B.Help Others, Help Yourself

C.Learn to compliment.

D.“You Look Nice Today”