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问题 单项选择题

《西厢记》全名《崔莺莺待月西厢记》共五本二十一折，写的是书生张生和前相国女儿崔莺莺的爱情故事，故事的主要情节来源于唐代（）的传奇《莺莺传》（又名《会真记》）。

A．李邕

B．刘长卿

C．元稹

D．白居易

答案

参考答案：C

解析：

[详解] 本题考查文史知识。《莺莺传》为唐代传奇，唐代诗人元稹撰。原题为《传奇》，《异闻集》载此篇，还保存原题，《太平广记》收录时改作《莺莺传》沿用至今。又因传中有赋《会真诗》的内容，俗亦称《会真记》。

选择题

下列关于第一次国共合作的表述，不正确的是

A．反帝反封建的共同使命促成了国共合作

B．北伐战争的胜利是国共合作的重要成果

C．争取党内合作是中 * * 党作出的正确选择

D．陈独秀的右倾错误是合作破裂的主要原因
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单项选择题

About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along free on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.
The study of isolated roots has provided an understanding of the relationship between shoots and roots in intact plants. The leaves of the shoots provide the roots with sugar and vitamins, and the roots provide the shoots with water and minerals. In addition, roots can provide the shoots withorganic nitrogen compounds. This comes in handy for the growth of buds in the early spring when leaves are not yet functioning. Once leaves begin photosynthesizing, they produce protein, but only mature leaves can "export" protein to the rest of the plant in the form of amino acids.

Which of the following best describes the organization of the passage

A．The results of two experiments are compared.

B．A generalization is made, and several examples of it are given.

C．The findings of an experiment are explained.

D．A hypothesis is presented, and several means of proving it are suggeste
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