行政管理专升本都有什么科目需要学？

下列亲属中，属于第一顺序法定继承人的是（　　）

A.父母

B.兄弟

C.叔叔

D.姐妹

It seems so natural to put up an umbrella to keep the water off when it rains.But actually the?umbrella was not invented as protection against rain.Its first use was as a shade against the sun!
Nobody knows who first invented it,but the umbrella was used in very ancient times.Probably?the first to use it were the Chinese,as early as the eleventh century B.C.
We know that the umbrella was used in ancient Egypt and Babylon as a sunshade.And there?was a strange thing connected with its use:it became a symbol of honour and authority.In the Far?East in ancient times the umbrella was allowed to be used only by royalty or by those in high office.
In Europe,the Greeks were the first to use the umbrella as a sunshade.And the umbrella was?in common use in ancient Greece.But it is believed that the first persons in Europe to use the?umbrella as protection against the rain were the ancient Romans.
During the Middle Ages,the use of the umbrella practically disappeared.Then it appeared?again in Italy in the late sixteenth century.And again it was considered a symbol of power and authority.By 1680,the umbrella appeared in France,and later on in England.
By the eighteenth century,the umbrella was used against rain throughout most of Europe.Umbrellas have not changed much in style during all this time,though they have become much lighter in weight.It wasn′t until the twentieth century that women′s umbrellas began to be made,in a whole variety of colours.

Which of the following statements is NOT true about the umbrella?

A.No one exactly knows who was the inventor of the umbrella.
B.The umbrella was first invented to be used as protection against the sun.
C.The umbrella changed much in style in the eighteenth century.
D.In Europe the Greeks were the first to use the umbrella as a sunshade.

实践高于理论的认识是因为实践具有（ ）

A.普遍有用性的优点
B.绝对性的优点
C.直接现实性的优点
D.相对性的优点

求函数f(x)=x3-3x+1的单调区间和极值．