精馏塔的负荷能力主要条件是塔径和塔内的结构参数。一般来讲，塔径决定塔的负荷能力，塔高

酯类物质广泛存在于草莓、香蕉、梨等水果中，某同学从成熟的香蕉中分离出一种酯，然后将该酯在酸性条件下进行水解实验，得到分子式为C₂H₄O₂和C₄H₁₀O的两种物质。下列有关的分析判断正确的是[ ]

A．该同学分离出的酯的化学式可表示为C₆H₁₄O₃

B．水解得到的两种物质，C₂H₄O₂可以与金属钠作用产生氢气，而C₄H₁₀O不可以

C．C₄H₁₀O的同分异构体有很多种，其中属于醇类只有4种

D．水解得到的物质C₂H₄O₂和葡萄糖的最简式相同，所以二者的化学性质相似

     When The Grapes of Wrath(愤怒) was published on March 14, 1939, it created a national

sensation(轰动) for its description of the destructive effects of the Great Depression(大萧条) of the

1930s. By the end of April, it was selling 2,500 copies a day-a remarkable number considering the

hard economic times. In May, the novel was a number-one best-seller, selling at a rate of 10,000

copies a week. By the end of 1939, close to a half million copies had been sold.

     John Steinbeck was shocked by the tremendous response to his novel. Almost overnight, he found

himself involved in a great national debate over the migrant labor problem. Many people were shocked

by the poverty and hopelessness of the story, and others denied that such circumstances could happen in

America. Even people who had never read a book before bought a copy of The Grapes of Wrath. At $2.75 per copy, it was affordable and quickly sold out.

     However it was banned and burned in Buffalo, New York; East Saint Louis, Illinois; and Kern

County, California, where much of the novel is set. In fact, the novel remains one of the most frequently

banned books in the United States. The book was criticized sharply in Congress by Representative Lyle

Boren of Oklahoma, who called the novel's description of migrant living conditions a lie. Charges were

made that "obscenity"(淫秽) had been included in the book in large part to sell more copies. Eventually,

First Lady Eleanor Roosevelt stepped in to praise the book and defend Steinbeck against his critics. In

1940, the novel won the Pulitzer Prize.

     The popularity of the novel has endured(持久). It is estimated that it has sold fifteen million copies

since its publication. For almost sixty years, Steinbeck's novel has been a classic in American literature;

it has been translated into several languages, including French, German, and Japanese. The Grapes of

Wrath has also been a necessary part of the school curriculum in America since the end of World War II.

1. What does the underlined word "tremendous" probably mean?

A. good          

B. terrible          

C. dull      

D. great

2. Representative Lyle Boren of Oklahoma was__________. 

A. a crazy supporter of The Grapes of Wrath            

B. among the group against John Steinbeck

C. sympathetic to the migrant living conditions

D. criticized by the first lazy of that time

3.Which of the following is NOT mentioned as a reason why The Grapes of Wrath sold well?

A. It well describes people's life during that time.

B. The debate over it arose more readers' interest.

C. Readers were attracted by the obscenity in it

D. It was not expensive so people could afford it.

4.Which of the following is TRUE about The Grapes of Wrath?

A. It is about the migrant workers in America during 1940s.

B. The story mainly happened on California's grape farms..

C. Its description of the poor and hopeless life was a lie.

D. It remains a banned book in some places of the USA.

5. What can best prove the literature value of The Grapes of Wrath?

A. It was a number-one best-seller after its publication.

B. First Lady Eleanor Roosevelt praised it.

C. It has won many important prizes in America.

D. It survives the time and remains a classic.

对许多环境学家来说，植物的灭绝(随之而来的是各种农作物种类不断增加的基因一致性)是环境问题中最严重的一个问题。必须采取行动来阻止野生可食植物及不再耕种的可食植物的减少。否则，基因多样性的缺乏可能引起主要农作物的一大部分在一夜之间被毁掉。例如，在1970年，南方的叶菌病毁坏了大约20%的美国玉米作物，在该疾病所到之处只剩下很少的几种玉米未受影响。
从上段可推知下面哪一选项( )

A．某种植物疾病的易感染性是由基因决定的
B．美国种植的80%的玉米对南方叶菌病有抵抗力
C．野生可食植物的灭绝几乎总是可以追溯到毁灭性的植物疾病(这一原因)
D．植物培养者致力于研究可抵抗植物疾病的植物

患者女性52岁，拟一次性拔除口内多个残冠残根，注射局麻药后患者出现全身麻木、心悸、胸闷，表情肌及全身抽搐，随即出现脉细而弱、血压下降、神志模糊。

针对上述情况采取的抢救原则中，哪项是错误的

A．降压

B．给氧

C．输液

D．镇静

E．应用激素

制备阿胶时加入冰糖的目的是

A．增加稠度

B．沉淀胶液中的泥土杂质

C．增加胶剂的透明度

D．降低黏性，便于切制

E．增加黏性，易于成型