具有阻止义齿向脱位作用的部分是（） A.支托 B.连接体 C.卡环臂 D.卡环体 E

中枢神经系统内，神经元之间兴奋性化学传递过程中，不具备 （）

A.单向传递

B.不衰减

C.时间延搁

D.电化学反应

E.易疲劳

阅读下面短文，然后回答问题。

     Many people believe that French people are very different from Americans. This is certainly true

where eating habits are concerned (有关的)! According to a report by the World Health Organization

(世卫组织), each year French people eat four times more better than Americans. In addition, they eat

more vegetables, potatoes, grain and fish. Yet, despite(不管) the fact that they eat larger amounts of

these foods, the French take in about the same number of calories each day as Americans.[ French and

American men consume(消耗) about 2,500 calories each day on average. French and American women

take in about 1,600 calories daily.]

     How can this be? If the French are eating more of certain types of foods, shouldn’t this add up to

more calories? And why are so few French people overweight compared to Americans? The answer

is that Americans consume 18 times more refined(精制的) sugar than the French, and drink twice as

much whole milk!

     Although many Americans believe the French end up each meal with gooey ( 胶粘的) desserts, this

just isn’t so. Except for special occasions, dessert in a typical French home consists of fresh fruit or

cheese. Many American families, on the other hand, like to end their meals with a bowl or two of ice

cream or another sweet treat.

1. Name six types of foods that French people eat more of each year than Americans.

      _______________________________________________________________________

2. How many calories does the average Frenchman consume each day?

      _______________________________________________________________________

3. How much whole milk does the average French person drink compared to the average Americans?

      _______________________________________________________________________

4. How much more refined sugar do Americans eat than the French?

      _______________________________________________________________________

5. What do French families usually eat for dessert?

     _______________________________________________________________________

下列各组物质中，酸性由强到弱排列顺序错误的是（　　）

A．HClO₄   H₂SO₄  H₃ PO₄

B．HClO₄  HClO₃  HClO₂

C．H₂ SO₄  H₂ SO₃  H₂ CO₃

D．HC1O  HBrO₄  HIO₄

青路面常见的损坏模式包括（）

A.沉陷

B.车辙

C.推移

D.开裂

E.松散和坑槽

以下哪一项不属于前三点式起落架的优点（）

A、重量较轻

B、地面运动的稳定性好

C、飞机重心位于主轮前边，有助于阻止飞机滑行时打地转

D、着陆时只需主轮先接地，比较容易操纵