变应性鼻炎属哪型变态反应（） A.Ⅰ型 B.Ⅱ型 C.Ⅲ型 D.Ⅳ型 E.以上都不是

用3个不同的数字组成6个不同的三位数，已知这6个三位数的和是1776，那么这3个数字分别是______．

锥体外病变可表现为（）

A.静止性震颤

B.腱反射亢进

C.折刀样强直

D.肢体瘫痪

E.共济失调步态

New research suggests that speaking more than one language may delay different kinds of dementia(痴呆), that is the loss of mental ability. In fact, researchers say, speaking two languages appears to be more important than the level of education in defending against dementias.

A study in India examined the effect of knowing more than one language in delaying the first signs of several dementias. Researchers studied nearly 650 people whose average age was 66. 240 of those studied suffered from Alzheimer's, the most common form of mental decline(下降). 391 of the subjects spoke two or more languages. Researchers found the dementias began about four-and-a-half years later in those who spoke two languages compared to those who spoke only one language. The level of education had no effect on the age at the first sign of dementia.

Thomas Bak, from the Center of Cognitive Aging at the University of Edinburgh in Scotland, who helped to organize the study, suggests that individuals who speak more than one language train their brains by moving back and forth between different words and expressions. He also believes this effort improves what scientists called executive(执行的) functioning, which often weakens in people with dementias. He states that researchers found there was no extra gain in speaking more than two languages.

Mr Bak says it does not appear important whether you learn another language at a young age or later in life. It's not something that “you missed the boat when you do not do it as a baby.” It is something that is still quite useful and powerful when you do it as an adult.

小题1:The finding of the study is that________.

A．learning more than one language can cure dementias

B．speaking two languages may delay kinds of dementias

C．the level of education matters in defending against dementias

D．people who suffer from dementias will lose mental ability小题2:The underlined word “subjects” refers to________.

A．people who were studied in the study

B．notices that were put on about the study

C．questions that were asked in the study

D．methods that were used in the study小题3:According to Mr Bak, ________.

A．the more languages one speaks, the less chance of getting dementias

B．people’s executive functioning often strengthens with age

C．when you learn one more language makes no difference

D．it is much easier to learn one more language at a young age小题4:This passage may probably be seen in________.

A．a research plan

B．a health magazine

C．a book review

D．a business magazine

硫酸是工业生产中最为重要的产品之一。

(1)工业上制硫酸主要分为_________、__________、__________三个阶段。

(2)下列是第二阶段反应的有关实验数据，请选择最合适的生产条件_______________。

(3)现欲提高反应速率和SO₂的转化率，下列措施可行的是_________（填序号）。

A．向装置中通入氮气且保持体积不变

B．向装置中通入氧气且保持体积不变

C．添加更多的催化剂

D．降低温度，及时转移SO₃

(4)硫酸生产的尾气中含有少量SO₂，可用石灰水吸收后，再用硫酸处理。此过程涉及的化学反应方程式为_______________________、___________________。

(5)若进入第二阶段，设备中气体的体积分数为7%SO₂、11%O₂、82%N₂。现有100体积这样的混合气体在反应后变为96.7体积，则反应后混合气体中N₂和SO₃的体积比为______，此时SO₂的转化率为______。

谷坊按谷坊的透水性质可分为透水性谷坊与不透水性谷坊，下列谷坊分类中属于不透水性谷坊的是（）.

A.土谷坊

B.浆砌石谷坊

C.混凝土谷坊

D.插柳谷坊

E.竹笼装石谷坊