超声发现子宫明显大于相应孕周子宫，宫腔内见弥漫性分布的点条状回声及大小不等的无回声区

由俄罗斯人创立，并经欧美人参与完善的TRIZ（萃智）方法的主要特点是（）。

A.基于产品进化趋势的客观启发式方法

B.大量采用自然科学及工程中的效应知识

C.是面向机器的

D.利用出现问题领域的知识

An 80-year-old man was sitting on the sofa in his house along with his 45-year-old highly educated son.

Suddenly a crow（乌鸦）perched on the tree near their window.

The father asked his son, “What is this? ”

The son replied, “It is a crow.”

After a few minutes, the father asked his son the 2^nd time, “What is this?”

The son said, “Father, I have just now told you It’s a crow’. ”

After a little while, the old father again asked his son the 3^rd time, “What is this? ”  

“It’s a crow, a crow, a crow.” said the son loudly.

A little after, the father again asked his son the 4^th time, “What is this?”

This time the son shouted at his father, “Why do you keep asking me the same question again and again? ‘IT IS A CROW’. Are you not able to understand this?”

A little later the father went to his room and came back with an old diary, which he had kept since his son was born. On opening a page, he asked his son to read that page. When the son read it, the following words were written in the diary:

“Today my little son aged three was sitting with me on the sofa when a crow was sitting on the window. My son asked me 23 times what it was, and I replied to him all 23 times that it was a crow. I hugged him lovingly each time he asked me the same question again and again for 23 times. I did not at all feel annoyed; I rather felt affection for my innocent child. ”

小题1: In what tone did the son say to his Father “It’s a crow, a crow, a crow. ”?

A．impatient

B．excited

C．hurried

D．surprised小题2:Why did the Father ask the same question again and again?

A．Because he wanted to make his son angry.

B．Because he was too old to remember anything.

C．Because he couldn't understand what his son said.

D．Because he wanted to see how patient his son would be.小题3:How old was the old man when his son asked him 23 times “What is this”?

A．35 years old.

B．38 years old.

C．45 years old.

D．80 years old.小题4:What is the most suitable title for the passage?

A．A crow.

B．Father's love.

C．An old dairy.

D．An old man.

一件工作，由甲单独做10天能完成，乙单独做12天才能完成，丙独做15天才能完成．如果三人合做，多少天可完成？

标高

最佳证据应具备的特性（）、（）、（）。