问题 问答题 简答题

农地水土保持栽培措施的任务、种类与功能?

答案

参考答案:水土保持栽培技术的种类有:轮作技术措施;间作、套作和混播技术措施;等高带状间作;等高带状间轮作。

一.作技术措施:考虑采用一种轮作方式时,使农作物产量最高,牧草生物产量也最高,才是合理的轮作方式。

栽培农作物按作用可分为:a中耕农作物,如玉米、棉花、土豆是水土保持作用较小的。b密播农作物,如小麦、大麦、莜麦、谷类等禾本科和豆类。c一年生和多年生的牧草。

二.作、套作和混播:是改良土壤的一项有效的农业技术措施。

a间作:两种作物同时在一块地上间隔种植的一种栽培技术,如玉米间作大豆,玉米间作马铃薯。

b套作:在同一块地上,不同时间播种两种以上的不同作物。

c混播:指两种作物均匀的散播,或混播在同一播种行内,或在同一播种行内进行间隔播种,如小麦混播豌豆。

应该指出,在进行农作物间作、套作、混播的时候,必须结合水土保持耕作技术措施,如垄沟种植、水平垄沟、横坡耕作等,使其发挥更大的蓄水保土和提高作物产量的作用。

三.高带状耕作:就是沿着等高线将坡地划分为若干条地带,在各条带上交互或轮流种植密生作物与疏植作物,或牧草与农作物的一种坡地保持水土的种植方法。

a农作物带状间作,就是利用疏生作物和密生作物成带状相间种植。

b草田带状间作,就是利用牧草与农作物成带状相间种植。

四.高带状间轮作:

先划分若干条,再根据粮草轮作的要求,分带种植作物和草。

单项选择题
阅读理解

In today’s Internet age, the demand for online games continues to grow. Online computer game centers exist in many cities and towns throughout Asia. Facing the pressures of school and life, people tend to the virtual world, expecting a diversion from these problems. Too often, however, they can lead to problems and unhealthy addictions 迷。

This is most clearly seen in the example of South Korea. The country has the world’s highest percentage of high-speed Internet services. It also has a high number of online game players and related problems. In 2002, a young man collapsed(突然晕倒) and died while playing online games. He had been playing almost nonstop for 86 hours at an Internet café. Another young man killed his sister after becoming confused between the online world and real life. A 12-year-old boy stole US $ 16,000 from his father and ran away from home. He did this to continue his obsession(着迷) with an online game. Such problems, however, don’t just happen in South Korea. They are spreading to other parts of Asia, as well.

What kinds of people develop online game addiction? What does the problem look like? Dr. SueHuei Chen, a clinical psychologist, researches Internet addiction. She discovered some signs of at-risk individuals such as lack friendships and good social skills. Those problem individuals feel it so compulsive 难控制的to play online games that they could sacrifice things such as school or family. They feel the need to spend more and more time online. And they become upset if anyone tries to limit限制 their online game playing.

How many problem game players are there? In mainland China, the potential number of problem online gamers is alarming. In 2004, the China daily reported that China had 13.8 million online game players. Furthermore, it stated that 80 percent of these were under 25 and had signs of addiction. Such numbers point toward a growing problem among Chinese young people.

Make sure to keep control over your online game playing. If you don’t control it, it can get control of you.

小题1:What is mainly discussed in the passage?

A.The disadvantages of the Internet.

B.The online game problems in Asia.

C.The popularity of online games worldwide.

D.The cause of online game addiction.小题2:The underlined word “diversion” in the first paragraph is closest in meaning to __________.

A.career

B.comfort

C.escape

D.support小题3:According to Paragraph 2, which of the following statements is NOT true?

A.The young killer’s sister was killed in a fictional 科幻 world

B.Online game playing is responsible for the young man’s death.

C.People in South Korea have access to the Internet most easily.

D.The teenage boy stole money because of his playing games online.小题4:What can we learn from the passage?

A.Most people in Asia have developed an addiction to online games.

B.Online game addictions cause many life-and-death arguments in South Korea.

C.Lonely and unsociable people seem to more easily develop Internet addictions.

D.In the year 2004 there were a total of 13.8 million Chinese visiting the Internet.