由于木材的弹性横量低，跨度较大，截面多数情况受（）计算控制。 A.强度 B.挠度 C

阅读短文，选择正确答案。

      Who hasn't enjoyed eating peanuts? Did you know that although peanuts look like nuts and taste like nuts,

they aren't nuts at all? They belong to the pea family, so they are called peanuts. The peanut grows flowers

above ground, but its "fruit" grows underground. It grows in more countries than most other "nuts".

      The peanut is a native South American plant. Scientists believe that it grew wild in Brazil long ago. They

think that for several thousand years the early peoples of South America made it a part of their diet. These

peoples were nomads who moved on when a natural food could no longer be found in one area. Along the way

they probably let fall some peanuts, which got into the ground and grew. This is believed to be the way the plant

reached the place where the Incas (印加人) lived. The Incas, from about 1100 to 1532, thought highly of

peanuts. The peanuts were eaten in several forms and used as sacrificial offerings (祭品) to the Incan Sun

God. Later in the 16th century, European soldiers had brought peanuts to other parts of the world, including

North America, Africa, Asia, Europe, and Pacific Islands.

      Although peanuts were found native in South America, they are now grown in almost every country that

has warm weather. India produces the most peanuts. China's production is next, followed by the United States. 

      The peanut is special in more ways than one. It can be eaten raw, boiled, roasted, or fried. Hundreds of

widely different products have been made from it. Carver, an American scientist, set himself the task of

discovering new uses for eating and for many other products. 

      Peanuts are very highly nutritious and are also high in protein (蛋白质). Americans use about

seven-tenths of their protein in the form of meat. In India, where the poor can't pay for meat or milk, peanut

meal and peanut milk have been produced. These have been a great help to the poor.

      New products are continually being made from peanuts, among them peanut cheese and a powder that

becomes peanut butter when water is added. The fact is that peanuts are so healthy that they were used by

astronauts. The unusual nut that isn't a nut is one of nature's most amazing gifts.

1. Although we like eating peanuts, many of us don't know peanuts belong to _______ family. [ ]

A. the pea

B. the nut

C. both the pea and the nut

D. neither the pea nor the nut

2. Which paragraph (段落) mainly talks about the history of the peanut?[ ]

A. Paragraph Four

B. Paragraph Three

C. Paragraph Two

D. Paragraph One

3. What does the underlined word nutritious mean? [ ]

A. Helpful for staying healthy.

B. Helpful to the poor.

C. Delicious and tasty.

D. Rich in fat and oil.

4. Which of the following is TRUE according to the article? [ ]

A. Nomads always stayed in the same place.

B. The peanut was first found in South America.

C. Astronauts ate lots of peanuts to keep healthy.

D. China grows fewer peanuts than the US.

5. What is the purpose of the article? [ ]

A. To show that peanuts belong to the pea family.

B. To advise us to use more peanut products.

C. To tell us some new uses of peanuts.

D. To let us know more about peanuts.

某同学利用打点计时器所记录的纸带来研究做匀变速直线运动小车的运动情况，实验中获得一条纸带，如图所示，其中两相邻计数点间有四个点未画出。已知所用电源的频率为50HZ，小车运动的加速度a=______________m/s²。（计算结果要求保留三位有效数字）

小儿1岁时肾功能渐趋成熟，但在下列肾功能指标中，哪项数值根本未增加

A．肾小球滤过虑

B．肾血浆流量

C．肾小管回收功能

D．肾小管排泌功能

E．肾单位

钢轨焊接时，应严格按操作规程操作，防止（）。

A.事故

B.烫伤

C.砸伤

D.触电

赤峰市被列为自治区级重点保护单位的烈士陵园及纪念设施有哪些？