问题 综合

下面两图中,图甲的曲线表示年等降水量线,A所示区域是位于渭河以北的渭北黄土高原,如今这里已成为“陕西苹果”这一绿色果品的主要产区。读甲、乙两图,回答下列问题。

(1)为了保证“绿色苹果”产业的不断发展,科技人员与果农们摸索了果、畜、沼、窖、草“五配套苹果园”生态生产模式(见图乙)。分析该生产模式为什么既能降低生产成本又能生产“绿色苹果”?

(2)渭北黄土高原苹果产业的发展极大地改善了生态环境,为什么?

答案

(1)沼渣和沼液是优质的有机肥料,施入果园,减少了化肥的施用量,由于沼液含有大量的养分和抗生素,对影响果树生长的病虫害有防治作用,也减少了农药施用量、降低生产成本、保证了苹果无公害无污染。

(2)大面积的果树和草被,起到防风固沙、涵养水源、保持水土、调节气候、减少旱灾的作用,生态环境不断改善。

题目分析:(1)直接根据图乙从提高资料的利用率、减轻化肥、农业的使用,保护土壤肥力和减轻土壤污染和食品污染等方面综合分析。(2)黄土高原地区主要的生态环境问题是水土流失,林果业的发展利于恢复植被,并能结合黄土高原地区植被具有涵养水源、保持水土、调节气候等综合性功能分析即可。

点评:本题难度一般,学生只要掌握生态农业的基本生态特征可从经济效益、环境效益和社会效益综合分析,并结合黄土高原主要的生态环境问题综合分析其林果业的环境效益。

选择题
阅读理解

阅读理解。

     John H. Johnson was born in a black family in Arkansas City in 1918. His father died in an accident

when John was six. He was reaching high school age, but his hometown offered no high school for blacks.

     Fortunately (幸运地) he had a strong-willed, caring mother. John remembers that his mother told him

many times, "Son, you can be anything you really want to be if you just believe." She told him not to be

dependent on others, including his mother. "You have to earn success," said she. "All the people who work

hard don't succeed, but the only people who do succeed are those who work hard."

    These words came from a woman with less than a third-grade education.She worked hard as a cook for

two years to save enough money to take her son-then 15-to Chicago.

     Chicago in 1933 was not the promised land (乐土) that black southerners were looking for. John's

mother and stepfather could not find work. But here John could go to school, and here he learned the power

of words-as an editor (编辑) of the newspaper at Du Sable High School. His wish was to publish a magazine

for the blacks.

     While others discouraged him, John's mother offered him more words to live by: "Nothing beats a failure

but a try." She also let him pawn (典当) her furniture to get the $500 he needed to start the Negro magazine.

     It is natural the difficulties and failures followed John closely until he became very successful. He always

keeps his mother's words in mind: "Son, failure is not in your vocabulary." Now John H. Johnson is one of

the 400 richest people in America.

1. Why did John's mother decide to move to Chicago? Because _____.

A. life in Chicago would be better for the blacks than for the whites

B. John's father died in his hometown when John was very young

C. there were no high schools for the blacks in their hometown

D. John needed education and he could go to school there

2. The underlined sentence in the fifth paragraph means _____.

A. if you try, you will surely succeed

B. a try is always followed by a failure

C. only by trying can you get out of failure

D. a failure is difficult to beat, even if you try

3. We can learn from this passage that John's mother _____.

A. didn't depend on others or give up easily

B. thought success only came from working hard

C. thought one could be whatever one wanted to be

D. believed one would succeed without working hard

4. What can be inferred from this passage?

A. If someone wants to be successful,he should always stand firm.

B. Chicago was the promised land for the whites in 1933.

C. John's father died in an accident during the war.

D. John's mother was caring for him.