问题 解答题

将颗粒完整饱满的若干种子平均分成甲、乙两组,将甲组种子种植在肥沃潮湿的土壤中,乙组种子种植在贫瘠湿润的土壤中,且温度适宜.这两组种子的发芽状况和最先突破种皮的结构是(  )

A.甲先发芽,胚根

B.几乎同时发芽,胚芽

C.乙先发芽,子叶

D.几乎同时发芽,胚根

答案

种子萌发的外界环境条件是充足的空气、适宜的温度和一定的水分,与土壤的肥沃程度无关,所以两组种子会同时萌发,只不过在发芽后种在肥沃的土壤中的长成的植株比贫瘠的土壤中的要健壮些.种子萌发的过程:种子在萌发过程中先吸收水分,体积膨大,种皮胀破.同时,胚内的生命活动活跃起来,从子叶得到营养物质和能量后开始分裂和生长:胚根伸长突出种皮,发育成根,不久,从这条根的周围又生出一些细根;此后胚芽发育成茎和叶、胚轴发育成连接茎与根的部分.

故选D

阅读理解

One hundred new bookstalls that will sell newspapers as well as books have been making their debut on city streets since Saturday morning.

The newsstands are part of the city’s efforts to improve the appearance of streets and neighborhoods. The news-stands’ design, featuring large glass window, will help the customers to see what is on sale at a glance.

An electrical screen on the newsstands will announce immediately the arrival of the latest papers. The newsstands will also help collect utility fees. There will be 1,000 newsstands by the end of the year. The newly formed Oriental Books and Papers Service Co. Ltd will manage the stalls. According to sources from the company, over 80 percent of the people hired to operate the stands will be recruited from laid-off workers. This means the project will help ease the city’s unemployment pressure, sources said.

All recruited will undergo a training programme and be clad in green uniform. Municipal Vice-part Secretary Gong Xueping said the installation of the 100 stands was just the first step towards the objective of setting up 1,000 stands in the city by the end of the year.

He said the creation of the stalls would be of particular significance to the enhancement of the city’s spiritual civilization. He also made some suggestions regarding the location, design, and construction of the new stands, and the renovation of the existing newsstands.

57. One hundred new bookstalls are set up to _______ .

A. classify the bookstores                                 

B. beautify the streets and neighborhood

C. enrich people’s minds with knowledge           

D. increase people’s purchasing power

58.The newsstands are made of large glass windows to ______ .

A. beautify the streets                        

B. differ from other shops

C. let the customers browse through what they want

D. reduce the expenses of the construction

59.Which sentence is not true?

The newsstands also help gather together other public service charges

The newsstands will make known the arrival of the current issue of paper.

These kinds of newsstands will widely set up.

The newsstands just sell newspapers and magazines.

60.What is the other purpose of building these newsstands? Give the laid—off workers a chance

to _______.

A. make a living                             B. take up hobbies

C. ease their pressure                       D. enrich their minds

多项选择题