为什么说维管形成层是非典型的次生分生组织?

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问题:

为什么说维管形成层是非典型的次生分生组织?

考点:植物学结构植物学结构植物学题库
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阅读理解。
     Japanese toy maker, Sega Toys
Company, made the world's smallest piano.
The piano has 88 keys and each key is only
4 mm wide. It weighs 2.5 kg. It was reported
that the piano was put on the market in Japan
on April l, 2007 at 47000 yen.
     The kiwi fruit (猕猴桃) is very popular all
over the world. It's planted in China, New
Zealand, the United States and many othercountries.
It's rich in Vitamin (维生素) C and Vitamin E. It's
good for people. Its leaves can be used as medicine.
     Almost 5000 years ago, people in Egypt
cleaned their teeth with a kind of powdered
(成粉状的) egg shells and other things. They
did that with their fingers.The Greeks, the
Romans, the Chinese and the Indiansalso did
a lot for the development of toothpaste.
     Football was invented in England in 1863.
The Football Association Challenge Cup was
organized in 1872. The FIFA was founded
(成立) in 1904. Today, 203 countries are
FIFA members. Football became an Official
(正式的) Olympic event in 1908.
     Popcorn was very popular in America from
the 1890s. Street sellers used to bring poppers
through streets. At that  time, a banker started
his popcorn busi ness after his bankfailed. He
made enough money and bought three large
farms.
     In 1895, American's William Morgan invented
a new indoor game, "Mintonette," which later
became volleyball. It was an inexpensive sport,
compared with two other games, basketball
and tennis that were played by the rich.
1. In ancient Egypt, people cleaned their teeth with their _____.
A. toothbrushes
B. fingers
C. modem toothpaste
2. The FIFA was founded in _____.
A.1895
B.1872
C.1904
3. The banker who had made enough money bought _____.
A. three large farms
B. the world's smallest piano
C. a kind of powdered egg shells
4. From the passages, we know _____ has rich Vitamin C and Vitamin E.
A. the popcorn
B. the egg
C. the kiwi fruit
5. How many ball games are mentioned in the passages above?
A. Three.
B. Four.
C. Five.
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在社会主义初级阶段的收入分配制度下,各种生产要素按其在生产过程中的()参与分配。

A.稀缺程度 

B.数量多少 

C.实际来源 

D.贡献大小

题型:问答题 简答题

功能活动问卷评分等级1分表示()

A.能做但从未做过

B.困难但可单独完成

C.需要小量帮助

D.需要大量帮助

E.完全依赖他人

题型:问答题 简答题

()主要用于大型项目或大型复杂项目,特别是业主管理能力不强的情况。

A.项目管理承包模式

B.建筑工程管理模式

C.项目管理服务模式

D.“代建制”模式

题型:问答题 简答题

红光的互补色光为()。

A.绿

B.青

C.蓝

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