问题 选择题

“黑火药”是我国古代四大发明之一,它由硝酸钾、硫磺、木炭组成。“黑火药”属于 (  )

A.混合物

B.化合物

C.单质

D.纯净物

答案

答案:A

题目分析:由多种物质混合而成的是混合物;由一种物质组成的是纯净物;只由一种元素组成的纯净物,是单质;由两种或两种元素组成的纯净物,是化合物;只由两种元素组成,其中一种是氧元素,属氧化物。根据概念可知:“黑火药”由硝酸钾、硫磺、木炭组成,即由多种物质混合而成的,是混合物。故选A。

阅读理解

Mary was an operator(接话员) 911 in Los Angeles. One Thursday morning, she was surprised to get a call from a little girl. She said, “Mom my ill, Mom my ill,’ again and again, Mary soon found the address of the call. She called the police. In a minute, the policemen and doctors arrived at the house. They broke the door open. They couldn’t believe their eyes. The little child was so young that she could not walk! She was sitting beside her mother and holding her mother’s hand. Tears were running down her face.

The doctors gave the women some medicine and soon she woke up. Later, she told people, “Everyone was surprised that my daughter could call 911. On Monday I tried to teach her how to call 911, but she couldn’t do it. ” Mary was surprised, too. “It’s the first time I have seen a two-year-old child call 911.”

小题1:What did the girl really want to say?

A. “Mom, I’m ill.”

b. “My mom is ill.”

C. “Mom and I are ill.”

小题2:How did the policemen feel when they got into the room?

A. Strange.           B. Normal.        C. Surprised.

小题3:How did the policemen get into the room?'

A. By breaking the door.

b. With the girl’s help.

C. Through the window

小题4:What does the underlined(下划线的) word “it” mean?

A. 911.           B. Calling 911.        C. Walking.

小题5:What can we learn from the passage?

A. The little girl was so clever that she could call 911 when she was 2.          

B. The love for her mother created the miracle(奇迹).        

C. The mother knew she had to teach the little girl how to call 911.

填空题