关于甲状腺结节的叙述，哪项是不正确的（） A.儿童时期出现甲状腺结节，50%是恶性的

写出一个系数是2004，且只含x，y两个字母的三次单项式______．

以下关于上层建筑的说法正确的是（）

A、上层建筑是在干舷甲板上从舷边跨到舷边或其侧壁板离舷侧板向内不大于船宽4%的甲板建筑物

B、后升高甲板可以视为上层建筑

C、干舷甲板通常是最高一层露天全通甲板，当较低一层甲板符合干舷甲板条件，并选定为干舷甲板时，该甲板以上部分船体就干舷核定而言可以视为上层建筑

D、以上说法均不正确。

我国有丰富的海水资源，开发和利用海水资源是当前科学研究的一项重要任务。

（1）工业上常以食盐为原料制备氯气，再用氯气制备漂粉精，请写出制备漂粉精的反应的化学方程式

_________________________。

（2）次氯酸不稳定，见光易分解，请写出次氯酸见光分解的反应的化学方程式：__________________。

（3）从海水中提取食盐和溴的过程如下

Ⅰ．①步骤Ⅰ中已获得Br₂，步骤Ⅱ中又将Br₂还原为Br^-，其目的为富集溴元素，请写出步骤Ⅱ的化学方程式：__________________。

②在3mL溴水中，加入1mL四氯化碳，振荡、静置后，观察到试管里的分层现象为下左图中_________。

Ⅱ．某化学研究性学习小组为了解从工业溴中提纯溴的方法，查阅了有关资料，Br₂的沸点为59℃。微溶于水，有毒性和强腐蚀性。他们参观生产过程后，设计了如下右装置简图：请你参与分析讨论：

①实验装置气密性良好，要在C中获得纯净的液溴即达到提纯溴的目的，操作中控制的关键条件是：___________________________。

②为除去该产物中仍残留的少量Cl₂，可向其中加入_________溶液，充分反应后，再进行的分离操作是

_________。

阅读理解。

     How to eat healthfully can be especially complex for working women who often have

neither the desire nor the time to cook for themselves (or for anyone else )．Registered

dietitian Barbara Morrissey suggests that a few simple rules can help.

     "Go for nutrient－dense foods,"she suggests,"foods that contain a multiple of nutrients.

For example,select whole wheat bread as a breakfast food,rather than coffee cake. Or

drink orange juice rather than orange drink,which contains only a small percentage of real

juice-the rest is largely colored sugar water. You just can't compare the value of these

foods, the nutrient－dense ones are so superior,"she emphasizes.

     Morrissey believes that variety is not only the spice of life,it's the foundation of a healthful

diet. Diets which are based on one or two foods are not only almost impossible to keep up

the strength,they can be very harmful, she says, because nutrients aren't supplied in enough

amounts or balance.

     According to Morrissey,trying to find a diet that can cure your illnesses,or make you

superwoman is a fruitless search." As women,many of us are too concerned with staying

thin,"she says,and "we believe that vitamins are some kind of magic cure to replace food."

     "We need carbohydrates,protein and fat－they are like the wood in the fireplace. The

vitamins and minerals are like the match,the spark,for the fuel,"she explains." We need

them all,but in a very different proportions(部分). And if the fuel isn't there,the spark is

useless."

1．From the first paragraph we know that working women________.

A．think cooking is especially complicated

B．do not share the same views with registered dietitians

C．are busy and not interested in cooking

D．are likely to eat healthfully

2．Orange juice is different from orange drink because________.

A．it contains only a small percentage of real juice

B．it is natural,nutritious and prepared from real oranges

C．it is largely orange－colored sugar water

D．it produces nothing but calories

3．In Paragraph 4,"a fruitless search" means "____"．_____

A．an effort with no results

B．a search for a diet without fruits

C．a research on fruitless diet

D．a diet serving as medicine

4．Many women take it for granted,according to the passage that________.

A．a balanced diet can result in being fat

B．staying thin and healthy are both possible

C．lack of variety in diets leads to staying thin

D．vitamins are some kind of substitutions(代替物)for food

5. By saying "if the fuel isn't there,the spark is useless",the author means "________"．

A．carbohydrates,protein and fat are enough to support a human life

B．vitamins and minerals are almost of no value

C．carbohydrates,protein and fat are as important as vitamins and minerals

D．without carbohydrates,protein and fat,vitamins and minerals are of no use

所谓技术创新，是指对新产品、新过程的商业化以及对新组织结构等进行搜寻、发现、改善和采用的一系列活动的总称。某种观点认为，完全竞争的市场结构不利于促进技术创新。这种观点的主要依据是______。

A．在完全竞争条件下，由于存在较多的竞争对手，企业为了生存，不得不加快创新速度
B．在完全竞争条件下，企业规模一般偏小，并且缺乏垄断利润作为技术创新的投资
C．在完全竞争条件下，由于产品容易被模仿，因此企业缺乏技术创新的动力
D．垄断竞争的市场结构是最适宜技术创新的市场结构