从布拉格方程出发，讨论X射线衍射的主要实验方法。

阅读理解。

     Like most people, you've probably never given your blood glucose (糖) a second thought, unless you have

diabetes (糖尿病). But researchers now know that whether or not you have diabetes, eating too much can

make your blood glucose go up and down and can increase the danger of heart disease. It may be even bad for

your memory.

     This realization has greatly changed the way we understand food and health. Luckily, none of these things

happen ovemight, and even small changes in the food you eat every day can start you on a healthier path.

     When you are hungry, do you reach for a chocolate cake or a box of biscuits? These "fast-acting" foods

are handy and they take no time at all to dissolve (溶化) in your stomach. Then they race into your blood,

running through your body with blood glucose. The trouble is the comfort doesn't last long, leaving you feeling

hungry again. As a result, your blood glucose will run out of control.

     It's no wonder most of us have less energy than we'd like and feel tired too often. It's also no wonder that

most of us weigh more than we want to. Yes, eating too much and exercising too liLtle are main reasons, and

ever changing blood glucose will send you shopping for bigger jeans.

     For most of us even when our blood glucose goes up and down after a large meal, our body can bring it

back to normal in a few hours. Only people with untreated diabetes have blood glucose levels that stay quite

high most of the time.

     For a long time, doctors thought that only these people needed to take care of their blood glucose levels.

Now, we know that even in healthy people, high levels after meals can damage (损坏) the body, even if it

never causes diabetes.

1. How does our blood glucose change after a large meal?

A. It remains unchanged.

B. It stays on high levels.

C. It goes up and down.

D. It comes back to normal.

2. What does the writer think of "fast-acting" foods?

A. He thinks they are delicious.

B. He thinks they are easy to get.

C. He thinks they make us healthy.

D. He thinks they damage our body. 

3. What shall we do if we want to keep the normal blood glucose?

A. Check our blood glucose after each meal.

B. Have proper food and exercise every day.

C. Eat certain kind of medicine before meals.

D. Ask the doctor for help from time to time.

将Na₂O₂逐渐加入到含有Al³⁺、Mg²⁺、NH₄⁺的混合液中并微热，产生沉淀和气体的物质的量（mol）与加入Na₂O₂的物质的量（mol）的关系如图所示，则原溶液中Al³⁺、Mg²⁺、NH₄⁺的物质的量分别为（　　）

A．2mol、3mol、8mol

B．3mol、2mol、8mol

C．2mol、3mol、4mol

D．3mol、2mol、4mol

2003年，武汉市农村居民8大类消费支出中5增3减。全年农村居民食品消费总支出人均1132.4元，比上年增长10.7%；衣着消费支出人均118.8元，增长17.6%；文化、教育、娱乐消费支出人均310.9元，增长6.1%；交通和通讯消费支出人均148.2元，增长27.8%；医疗保健消费支出人均141.7元，增长61.0%；居民居住消费支出人均254.2元，下降8.3%；家庭设备用品支出人均141.7元，下降7.8%；其他商品支出人均104.4元，下降16.5%。

2003年农村居民全年的恩格尔系数约为（）。

A．48

B．10

C．52

D．42

我车间使用的润滑油有（）。

A.机油

B.汽油

C.柴油

D.洗油

Starting with his review of Skinner’s Verbal Behavior, Noam Chomsky had led the psycholinguists who argue that man has developed an innate (天生的) capacity for dealing with the linguistic universals common to all languages. Experience and learning then provide only information about the (1) instances of those universal aspects of language which are needed to communicate with other people within a particular language (2) .

This linguistic approach (3) the view that language is built upon learned associations between words. What is learned is not strings of words per se (本身), but (4) rules that enable a speaker to (5) an infinite variety of novel sentences. (6) single words are learned as concepts: they do not stand in a one-to-one (7) with the particular thing signified, but (8) all members of a general class.

This view of the innate aspect of language learning is at first not readily (9) into existing psychological frameworks and (10) a challenge that has stimulated much thought and new research directions. Chomsky argues that a precondition for language development is the existence of certain principles "intrinsic (原有的) to the mind" that provide invariant structures (11) perceiving, learning and thinking. Language (12) all of these processes; thus its study (13) our theories of knowledge in general.

Basic to this model of language is the notion that a child’s learning of language is a kind of theory (14) . It’s thought to be accomplished (15) explicit instruction, (16) of intelligence level, at an early age when he is not capable of other complex (17) or motor achievements, and with relatively little reliable data to go on. (18) , the child constructs a theory of an ideal language which has broad (19) power. Chomsky argues that all children could not develop the same basic theory (20) it not for the innate existence of properties of mental organization which limit the possible properties of languages.

5（）

A.originate

B.initiate

C.launch

D.generate