问题 选择题

如图是a、b、c三种物质的溶解度曲线,下列说法正确的是(  )

A.a物质的溶解度一定小于b的溶解度

B.40℃时,a、b两种物质的饱和溶液中溶质的质量分数相同

C.c物质是一定是二氧化碳溶解度曲线

D.三种物质的饱和溶液分别从40℃降温到20℃,a、b析出的晶体质量相等

答案

A、a物质的溶解度一定小于b的溶解度,说法错误,因为没有指明温度,故A错误;

B、40℃时,a、b两种物质的饱和溶液中溶质的质量分数相同,说法正确,故B正确;

C、c物质是一定是二氧化碳溶解度曲线,说法错误,因为随温度的升高,溶解度减低的物质有很多,比如氢氧化钙,故C错误;

D、三种物质的饱和溶液分别从40℃降温到20℃,a、b析出的晶体质量相等,说法错误,因为a析出的晶体质量较多,故D错误.

故选B.

阅读理解

The accident at Lake Sherwood was in our backyard. An SUV(运动型多用途车)had gone off the road,down a hill, and collided with a tree. When we heard the wreck, I remembered to say “call 911”. My family was the first on the scene. Nick, my son, was on the cell phone with 911. He saw a friend who was a victim in the crash who was a 15 years old girl who was badly disfigured and had died instantly. It was a terrible scene.

There had been six people in the truck, all between 15 and 17 years old. My husband and I checked all the victims, and I picked one who was conscious and stayed with him. I talked with him and had him lay on the ground. When I asked him if he was hurt, he said he was sore all over. When help arrived, they asked me to stay and continue working with them. I did as Debbie Romine, .my instructor, said in class, and did what they wanted. They even said thank you before they left.

The sheriff deputies came by Saturday night to get our statements and play the 911 tape back, so Nick could identify all the voices in the background. They said over and over that the way he handled the call was the best they had heard in a long time. He was calm and worked with them even when he saw his friend who had died. The Sheriff’s Department is sending some people over to help us work through our emotions.

The first aid and CPR course I took in January really helped me. I just didn’t expect to put it to good use so soon.

Pennyd. Miller

Kansas State Dept of Education,Topeka

小题1:According to the passage, in case of an emergence, people should dial_______________.

A.110

B.120

C.800

D.911小题2:Who died immediately after the accident?

A.A girl.

B.The writer.

C.Debbie Romine.

D.Nick.小题3:Why did the Sheriff deputies come by Saturday night?

A.To arrest the offender.

B.To offer them help.

C.To get their statements.

D.To help them.小题4:According to the passage, which of the following statements is true?

A.The writer is a doctor.

B.All the people in the car were killed in the accident.

C.Debbie Romine offered much help to the victims.

D.The writer took a first aid and CPR course in January.小题5:We can infer from the passage that__________________.

A.The first aid and CPR course in January really helped the writer

B.The writer’s family were affected emotionally by the accident

C.The victims were all conscious after the accident

D.The police arrived long after the accident

问答题