组建研发机构要研究的主要内容有（）。 A.人才培育 B.操作人员拟占全企业人员总数的

导致井田制瓦解，封建土地私有制逐渐建立的根本原因是

A．生产力的发展

B．私田的大量出现

C．各诸侯国纷纷变法改革

D．周王室日益衰微

阅读理解。

     An 80-year-old man was sitting on the sofa in his house along with his 45-year-old son. Suddenly a crow

(乌鸦) landed on their window.

     The father asked his son, "What is that?"

     The son replied, "That is a crow."

     After a few minutes, the father asked his son for the second time, "What is this?"

     The son said, "Father, I told you just now. It's a crow."

     After a little while, the father asked his son the same question for the third time, "What is this?"

     This time, the son said to his father in a low and cold tone, "It's a crow, a crow." 

     After a moment, the father yet again asked his son for the fourth time, "What is this?"

     This time his son shouted at his father, "Why do you keep asking me the same question again and again?

I have told you already, 'IT IS A CROW'. Are you not able to understand this?"

     A minute later the father went to his room and came back with a diary, which he had kept since his son

was born. On opening a page, he asked his son to read that page.

     Today my little son aged three was sitting with me on the sofa when a crow suddenly landed on the window

edge. My son asked me 23 times what it was, and I replied him 23 times that it was a crow. I hugged him

lovingly each time he asked me the same question. I didn't at all feel angry, but instead felt affection for my

son.

     If your parents reach old age, do not look at them as a burden, but speak to them gently, and be kind to

them. From today say this aloud, "I want to see my parents happy forever. They have cared for me ever since

I was a little child. They have always showered me with love. I will take care of my old parents in the best

way no matter how they behave."

1. The writer mainly intends to _____. [ ]

A. tell us the function of a diary

B. call on us to love our parents

C. teach us what a crow is

D. introduce a pair of son and father

2. The underlined word "affection" (last but one Para.) probably means _____. [ ]

A. puzzlement

B. hatred (恨)

C. worry

D. love

3. We can infer that the father wrote that piece of diary at the age of _____. [ ]

A. eighty

B. three

C. thirty-eight

D. forty-five

4. The old man brought out the diary, which he had kept since his son was born, because _____. [ ]

A. he forgot what had happened

B. he would like his son to read it

C. it could remind himself of the past

D. he wanted to find what a crow was

结合实例论述什么是人的美，人的美有什么特点

酒精透明小体(aloholic hyaline)

如何使用基于同一概念的方法扩展检索概念？