Richards生长方程（)。

During the winter they would be quite happy, but every summer a lot of their relatives used to spend holiday in their house, and it was much cheaper than staying in hotel. Finally one day in June Mr. Richards complained to a clever friend of his who lived in the same place. “One of my wife’s cousins is going to bring her husband and children and spend ten days with us next month again. How have you prevented all your relatives from coming to live with you in summer？” “Oh,” the friend answered, “that is not difficult. I just borrow money from all the rich ones, and lend it to all the poor ones. After that, they seldom come again.” Hearing this Mr. Richards smiled.

第40题：The relatives preferred to stay in Mr. Richards’ house because ________.

[A] it was cool in summer

[B] they might spend less money

[C] they were more welcome

[D] it was a comfortable place

What do we learn from the words of Bill Clinton？

A．Ann Richards created a world for all the young people.

B．Ann Richards was the greatest feminist in the US.

C．Ann Richards helped young girls find their places.

D．Ann Richards was a kind-hearted person.

What did Ann Richards do before she worked as the treasurer of Texas

A．Deputy Secretary.

B．Foreign minister.

C．Country commissioner.

D．State governor.

A.总生长量

B.平均生长量

C.连年生长量

D.定期生长量

A.由于树木生长是依靠细胞的增殖不断增长，所以y(t)是关于年龄t的单调增函数

B.当t=0时，y(t)=0，这是树木生长方程需满足的初始条件

C.y(t)存在一条渐近线y()=A,A是该树木生长极大值

D.y(t)是关于的连续光滑的函数曲线

听力原文：Hello, everyone. I'd like to tell you a story about Miss Richards.

Miss Richards was a teacher at a school for boys and girls. She taught chemistry and physics from the lowest to the highest classes in the school. Sometimes the new classes learned rapidly, but sometimes they were very slow, and then Miss Richards had to repeat things many times.

One year, the first class had been studying chemistry for several weeks when Miss Richards suddenly asked, "What is water7 Who knows？ Hands up."

There was silence for a few seconds, and Miss Richards felt sad but then one boy raised his hand. "Yes, Dick？" said Miss Richards encouragingly. He was not one of the brightest students in the class, so she was glad this boy could answer.

"Water is a liquid which has no color until you wash your hands in it, then it turns black," the boy replied.

What was Miss Richards？

A．A chemistry teacher.

B．A physics teacher.

C．A science teacher.

A．symbol ... referent . . . thought

B．referent . .. thought . . . symbol

C．thought . . . symbol . .. referent

How did Miss Richards feel before Dick raised his hand？

A．Excited.

B．Disappointed and unhappy.

C．Angry and annoyed.

D．Confused.