问题 选择题

已知C3N4 晶体具有比金刚石还大的硬度,且原子间均以单键结合。下列关于C3N4晶体的说法正确的是

A.C3N4晶体是分子晶体

B.C3N4晶体中微粒间通过离子键结合

C.C3N4晶体中C-N键的键长比金刚石中C-C键的键长要长

D.C3N4晶体中每个C原子连接4个N 原子,而每个N原子连接3个C原子

答案

答案:D

阅读理解

阅读理解

      In 1924, Hachiko was brought to Tokyo by his owner, Hidesaburo Ueno, a professor in the

agriculture department at the University of Tokyo. During his owner's life Hachiko saw him off from

the front door and greeted him at the end of the day at the nearby Shibuya Station. The pair continued

their daily routine until May 1925 when Professor Ueno didn't return on the usual train one evening. The

professor had suffered a stroke at the university that day. He died and never returned to the station

where his friend was waiting.

     Hachiko was given away after his master's death but he routinely escaped, showing up again and

again at his old home. After time, Hachiko realized that Professor Ueno no longer lived at the house.

So he went to look for his master at the train station where he had accompanied him so many times

before. Each day, Hachiko waited for Professor Ueno to return. And each day he didn't see his friend

among the crowd at the station.

     Hachiko became a permanent figure at the train station, which eventually attracted the attention of

many people. Many of the people who frequented the Shibuya train station had seen Hachiko and

Professor Ueno together each day. Realizing that Hachiko waited for his dead master, their hearts

were touched. They brought Hachiko treats and food to nourish him during his wait. This continued for

10 years, with Hachiko appearing only in the evening, precisely when the train was due at the station.

     Hachiko: The True Story of the Royal Dogs of Japan is Hachiko's story, as well as an informative

look at dog culture in Japan and the history and tradition of the Akita-ken, one of the most ancient,

beloved and faithful dog breeds ever.

1. The underlined word "his friend " in the first paragraph refers to ______.

A. Hachiko

B. Ueno

C. Tokyo

D. Shibuya

2. Which of the following statements about Hachiko is NOT true?

A. Hachiko saw his master off from the front door everyday.

B. Hachiko appeared every evening in the station for ten years.

C. Many people offered Hachiko food during his waiting.

D. Hachiko was adopted by others after his master's death.

3. The first four paragraphs are developed mainly__________ .          

      

A. by cause and effect                

B. by order in space    

C. by order in time    

D. by examples

4. We can infer that Hachiko: The True Story of the Royal Dogs of Japan is likely to be ____.  

A. a book

B. a magazine

C. a song

D. a picture

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