下列公式正确的是（）。 A.需求的价格弹性＝ B.需求的价格弹性＝ C.供给的价格弹

这些年来，我国农业生产一直坚持高投入、高产出模式，耕地长期高强度、超负荷利用，耕地质量呈现出（）态势。

A、‘三小’‘三低’

B、‘三大’‘三高’

C、‘三小’‘三高’

D、‘三大’‘三低’

在工农业生产和日常生活中．盐酸、烧碱、纯碱、氯化钠、石墨、硫酸铜等物质都有着重要用途．请选择上述物质填空：

（1）用于制造药物及金属表面除锈的是______；

（2）在农业上用来配制杀菌剂波尔多液的是______；

（3）在日常生活里用于调味和腌渍食品的是______．

美国的一个动物保护组织试图改变蝙蝠在人们心目中一直存在的恐怖形象。这个组织认为，蝙蝠之所以让人觉得可怕和遭到捕杀，仅仅是因为这些羞怯的动物在夜间表现出特别的活跃。
以下哪项，如果为真，将对上述动物保护组织的观点构成最严重的质疑？（）

A．蝙蝠之所以能在夜间特别活跃，是由于它们具有在夜间感知各种射线和声波的特殊能力。

B．蝙蝠是夜间飞行昆虫的主要捕食者。在这样的夜间飞行昆虫中，有很多是危害人类健康的。

C．蝙蝠在中国及其他许多国家同样被认为是一种恐怖的飞禽。

D．美国人熟知的浣熊和中国人熟知的食蚊雀，都是在夜间特别活跃的羞怯动物，但在众人的印象中一般并没有恐怖的印象。

E．许多视觉艺术品，特别是动画片丑化了蝙蝠的形象。

下列叙述中不属于小脑功能的是（　　）

A．使身体运动协调

B．使运动准确

C．维持身体平衡

D．是脑与躯干、内脏之间联系的通路

Many immigrants to the United States find the decision to seek better lives for their families in America can have an unexpected and tragic consequence. Deep differences with their children develop over language and culture.
"Many immigrants arrive here without much education. Their kids soon gain language skills and also street marts on how to live in America, leaving the parents at a disadvantage, " Ileana, Roses, pastor of a Methodist church group operating in Virginia, said.
"Not only that but they find they cannot relate to children who quickly absorb American culture, " she said.
According to the US Census Bureau, the number of foreign born or first generation Americans reached 55 million last year, a record one in five of the total population.
A government survey of 922 immigrants in 2000 found that nearly 40 percent of those who had been in the United States for more than 15 years would still like to take English classes if they had the time.
Two thirds of low income households depended on their children for translation.
Psychologists and sociologists say parents can lose their position of authority in a family as a result and the effects of that can be far-reaching.
Children exposed to American pop culture that glorifies youth and sexuality often rebel when their parents try to impose the conservative values they brought with them.
"Americanization erodes all important aspects of parenting, " said Richard Weissbourd, who teaches education at Harvard University.
"I feel a part of me is dying with my children. They don’t listen to my music. I have to play it on Sunday morning when they are not around, " said an immigrant.

What troubles the immigrant parents most is ______.

A. that they can’t understand the English language
B. that they lose their position of authority in their families
C. that their children have lost sense of their own national values
D. how they can master the English language as soon as possible