试一试,你能运用光合作用、呼吸作用、蒸腾作用等原理解答实际问题吗? (1)如果将

题型:解答题

问题:

试一试,你能运用光合作用、呼吸作用、蒸腾作用等原理解答实际问题吗?

(1)如果将蔬菜和水果放入冰箱中,能保鲜较长时间,原因是冰箱温度低,降低了植物细胞的______作用,减少了有机物的消耗.

(2)五莲山风景区植被茂密,空气中氧气含量高,被誉为“天然氧吧”.这是植物进行了______作用,使得空气中的含氧量较高的缘故

(3)炎热的夏天,植物的叶片不会被强烈的阳光灼伤,这是因为植物进行了______作用,降低叶片的温度.

(4)小明种了一棵月季,为了让月季快点生长,小明给它施了许多肥料,结果几天后,月季却枯萎死亡,这是由于大量肥料使士壤溶液浓度______ (填“大于”或“小于”)根毛细胞内细胞液浓度,导致月季______ (填“吸水”或“失水”)而出现的“烧苗”.

(5)农业生产上,农作物应当合理密植,才能使产最提高,这利用了植物的______作用原理.

考点:蒸腾作用探究实验:绿叶在光下制造有机物呼吸作用
题型:解答题

下列哪项不属于煤矿粉尘的危害?()

A.爆炸

B.矽肺

C.心脏病

题型:解答题

下列属于工程建设进度控制的经济方法之一的是( )。

A.业主在招标时提出进度优惠条件鼓励承包单位加快进度

B.政府有关部门批准年度基本建设计划和制定工期定额

C.政府招投标管理机构批准标底文件中的工程总工期

D.监理工程师根据统计资料分析影响进度的风险因素

题型:解答题

Johann Gutenberg, who worked as a goldsmith(金匠),took what has already been discovered, and created a small invention that changed history. He created a machine that allowed him to move small blocks of letters in such a way that written material could be printed and mass-produced. Few people could read before Johann Gutenberg made the invention, but once books became less expensive, more Europeans could read and write.

Block printing existed long before Gutenberg. The Chinese had been using wood blocks to print books as early as 868, but a new set of woodcuts(木刻印版) had to be made for each book. Producing one book was not easy; producing all kinds of books was more difficult.

Writing ink dates from about 2500 BC in Egypt and China. Johann Gutenberg use an oil-base printing ink that would last longer than other inks used in his time. We don’t know much about Gutenberg because he was not famous during his lifetime. He was born in Germany about 1400. In 1448, Gutenberg developed signatures for each number, letter, and punctuation mark(标点符号). He then built the molds (模型) to hold the signatures in place. Johann Gutenberg published the first mass-produced book: a 1,282 page Bible. To this day, more copies of the Bible have been printed the any other book.

Copies of Gutenberg’s invention spread throughout Europe, but the German goldsmith did not get rich from his invention. Some officials denounced the invention of printing because they feared that it would spread bad ideas. By 1500 there 1,700 printing presses in Europe. The presses had already produced about 20 million volumes of 40,000 different books.

小题1:What happened after Johann Gutenberg’s invention?

A.People could afford to read books.

B.People became interested in inventing.

C.It was still difficult to print all kinds of books.

D.Punctuation mark began to be used in printing.小题2:Compared with block printing in China, Johann Gutenberg’s method __________.

A.was difficult to run.

B.needed harder paper

C.used a new kind of ink

D.was put into use earlier小题3:The underlined word “denounced” in the paragraph means __________.

A.fought against

B.accepted

C.laughed at

D.supported小题4:What is the best title for the passage?

A.A famous 1,282 page Bible

B.The life of a famous inventor

C.An invention that changed history

D.The development of printing

题型:解答题

补写出下列名句名篇中的空缺部分(6分)

小题1:            ,下有冲波逆折之回川。黄鹤之飞尚不得过,                  。

小题2:君子博学而日参省乎己,                      。

小题3:              ,而后人哀之;                  ,亦使后人而复哀后人也。

小题4:同舍生皆被绮绣,                     ,腰白玉之环。

题型:解答题

胶液中凝胶含量增加,对橡胶的干燥效果()。

A、变差

B、无影响

C、变好

D、不确定

更多题库