委托人与代理人之间的协调和佣金结算相对简单的代理方式是( )。 A．共同代理 B

一般来说，在备选方案的评价与选择时，选择方案的标准由（）要素组成。

A.决策目标的要求

B.方案所要达到的效益值

C.方案实施的难易程度

D.方案实施所具有的风险程度

E.方案选择的方法

精子进入卵细胞后激活次级卵母细胞继续完成减数分裂，请问是从减数分裂的什么时期开始的？  [ ]

A．减数第一次分裂的前期

B．减数第一次分裂的中期

C．减数第二次分裂的中期

D．减数第二次分裂的后期

An eight-year-old child heard her parents talking about her little brother. All she knew was that he was very sick and they had no money left. When she heard her daddy say to her (1) mother," (2) a miracle can save him now", the little girl went to her bedroom and took out her piggy bank. She (3) all the change out on the floor and counted it carefully. Then she (4) her way six blocks to the drugstore.

"And what do you want" asked the shopkeeper. "It’s (5) my little brother," the girl answered back. "He’s really, really sick and I want to buy a (6) . His name is Andrew and he has something (7) growing inside his head and my daddy says only a miracle can save him. " "We don’t (8) miracles here, child. I’m sorry." the chemist said, smiling (9) at the little girl.

In the shop was a (10) customer. He stooped down and asked the little girl, "What kind of miracle does your brother (11) " "I don’t know," she replied. "He’s really sick and mommy says he needs (12) . But my daddy can’t pay for it, so I have brought my (13) .""How much do you have" asked the man. "One dollar and eleven cents, (14) I can try and get some more," she answered quietly. "Well, what a coincidence," smiled the man. "A dollar and eleven cents—the (15) price of a miracle for little brothers. (16) me to where you live. I want to see your brother and (17) your parents. "

That well-dressed man was Dr Carlton Armp, a doctor. The operation was completed without any (18) and it wasn’t long before Andrew was (19) again. The little girl was happy. She knew exactly how much the miracle cost—one dollar and eleven cents—also the (20) of a little child.

5（）

A．to

B．as

C．for

D．on

拉长命令可以修改圆弧的包含角和一些对象的长度，但不包括下列哪个对象（）。

A.直线、圆弧

B.封闭多段线

C.开放样条曲线

D.椭圆弧

亲水性信号分子