土地的重新构建价格中重新开发成本取求方法是（）。 A.成本法 B.市场法 C.分级法

下图是自然环境某物质循环的局部示意图，读图完成1 ～2 题。

1．若该图是水循环的局部示意图，其中椭圆表示海洋，则箭头②可能表示[     ]

A．地表径流      

B．地下径流      

C．大气降水      

D．蒸发

2．若该图是岩石圈物质循环的局部示意图，其中椭圆代表沉积岩，则①表示[     ]

A．岩浆活动      

B．变质作用      

C．外力作用      

D．地壳运动

完全竞争又称纯粹竞争，是一种竞争不受任何阻碍与干扰的市场结构。（）

It’s not easy to be an astronaut’s son. Everybody expects you to be special or perfect. I often wonder how my father ever had a son like me. I mean he’s so special and so good at everything he does. Even in middle school he was class president and captain of the football team.
Well, to be honest, I often dream about being some kind of hero or doing something special-like saving a child from a burning building or discovering a new star. I was daydreaming at school one morning when my teacher said there would be a Father’s Day writing competition for the whole school. "I hope we have a winner right here in my class. "
When I got home, I started to think about what to write. My father is an astronaut. No, I wouldn’t start like that. That was the way others saw him. How did I see my father Hmm.
I saw him sitting with me in the dark when I had a terrible dream. I remembered how he hugged me for hours when my dog Spotty was killed by a car. Yes, these were the things I was going to write. To me, he wasn’t just a world-famous astronaut. He was my dad.
My parents and I went to school Thursday night. There were so many people in the big hall! My dad looked at me, and I shrugged (耸肩).
The third prize was announced and it was not me. I was relieved (释然) and disappointed at the same time. The second prize was announced. It was me.
I went up to the stage and read what I had written, My Father’s Son. When I finished, the people stood up and cheered. I saw my father blowing his nose. Tears were running down my mother’s face. Dad cleared his throat and put his hand on my shoulder. "Son, this is the proudest moment of my life. "
It was the proudest moment of my life, too. Maybe I’ll never be a great hero or win a Nobel Prize, but it was enough just to be my father’s son.

What is the best title of the passage______

A．My Daydream
B．My Father’s Son
C．My Famous Father
D．My Happy Family

结肠癌的预后较好，经根治手术治疗后，DukesA、B及C期的5年生存率分别为（）。

A.95%、85%及50%

B.95%、30%及10%

C.80%、65%及30%

D.60%、55%及50%

E.以上都不对

人工授精有哪些优越性？人工授精的主要优越性是什么？