李明家的小麦产量总比邻近地的低,李明学习了植物的有关知识后怀疑该农田可能是缺少无

题型:选择题

问题:

李明家的小麦产量总比邻近地的低,李明学习了植物的有关知识后怀疑该农田可能是缺少无机盐,为此,他将该块肥力均匀的农田分成面积相等的四小块,进行田间实验.除施肥不同外,其他田间管理措施相同.实验结果如下表:

地块
施肥情况含氨无机盐含钾无机盐含磷无机盐不施肥
小麦收获量(kg)55.6656.8865.5255.11
从表中判断,该农田可能缺少的无机盐是(  )

A.含氨无机盐

B.含钾无机盐

C.含磷无机盐

D.无法确定

考点:科学研究方法植株生长需要的营养物质
题型:选择题

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

B. life was too hard for them to stay on in their hometown, while life in Chicago would be better for them

    Negroes

C. there were no schools in their hometown

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

2. What's the best title of the passage? [ ]

A.How John H. Johnson became somebody

B.The mental (精神的) support from a great mother

C.The importance of a good education

D.The key to success for blacks

3. The underlined sentence in the fifth paragraph means           . [ ]

A. if you try, you will succeed in the end

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

C. a try is always followed by a failure

D. nothing but a try can help you out of failure

题型:选择题

在X线检查中,对被检者的防护措施错误的是()

A.避免操作失误

B.选用多种X线检查方法

C.采用恰当的X线质和量

D.严格控制照射量

E.做好非检查部位的屏蔽防护

题型:选择题

在外观对准调节中,若沿望远镜筒(上边缘)方向观察光杠杆镜面时,看不到镜面中有标尺的象和观察者的眼睛,与出现此现象无关的原因是()

A.望远镜和光杠杆未处于同一高度

B.望远镜和光杠杆未正对

C.未调节物镜焦距,以致于标尺无法成象于十字叉丝平面上

D.望远镜未大致水平,光杠杆镜面及标尺未大致铅直

题型:选择题

在所有计算机会计输入环节中,我们经常用“垃圾进,垃圾出”来说明数据输入对会计核算软件的应用所具有的举足轻重的作用。( )

题型:选择题

三、根据下图,回答126~130题。

2005年广东省的贸易顺差总额为( )。(单位亿美元)

A.259.98

B.312.46

C.427.62

D.483.40

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