问题 选择题

生活中的下列物质既属于纯净物,又属于化合物,还属于氧化物的是(  )

A.洁净空气

B.蒸馏水

C.加碘食盐

D.食用纯碱(Na2CO3

答案

A、洁净空气中含有氧气、氮气、二氧化碳、稀有气体等物质,属于混合物,故A错;

B、蒸馏水是水一种物质,属于纯净物,由氢元素和氧元素组成,所以既属于氧化物又属于化合物,故B正确;

C、加碘食盐中含有碘酸钾和氯化钠,属于混合物,故C错;

D、食用纯碱是由碳酸钠一种物质组成,属于纯净物,由三种元素组成,不属于氧化物,故D错.

故选B.

阅读理解

根据短文内容, 选择正确答案。

Notice about Traveling to Oregon State University

  In order to give students a better understanding of the American economy,

culture and education, our school will organize a 15-day visit to Oregon State

University in the USA where speeches on American agriculture, economy and

culture will be given. Students will also have the chance to visit some American

universities and companies, go to concerts, watch sports events and visit San

Francisco and Portland. Students will be staying with local Americans on

weekends to experience western culture and customs. The total price of the trip

will be $1500, including accommodation (住宿), transportation and travel

expenses (费用). There will be an introduction meeting on Feb, 26th in Room

104 of Teaching Building at 1:00 pm. For more information please call at

84399117 or send an e-mail to mpp@njau.edu.cn.

1. The trip to Oregon State University will last _____ days.

A. 15    

B. 26    

C. 31    

D. 10

2. The speech to be delivered will NOT be on American _____.

A. agriculture        

B. economy 

C. culture            

D. education

3. If twin brothers, Victor and Sam, want to take this trip, they will have to pay

_____.

A. $1500  

B. $2000    

C. $ 3000  

D. $ 4500

4. If students want more information, which of the following contact details

(联系的细节) is NOT provided?

A. A phone number.      

B. An e-mail address.

C. The teacher’s name.  

D. A room number.

5. The above information is probably a(n) _____.

A. news report        

B. price list

C. guidebook          

D. advertisement  

选择题