亮亮，男，12岁。铁钉刺伤足底5小时，伤口深约1.5cm，来院时出血已止，伤口污染较

乳牙患龋在哪一个年龄段达到高峰（）

A.1～2

B.4～5

C.5～6

D.7～8

E.9～10

阅读下面材料：

        20世纪是中国发生巨大变化的100年，在这100年中，中国人民醒过来了，站起来了，富起来了。请回答：

①为使中国人民“醒过来”，孙中山领导的推翻清朝统治的历史事件是什么？ 

②中国人民“站起来”的标志是什么？今年是该事件发生多少周年？

③为使中国人民“富起来”了，我国在农村和城市分别进行了什么改革？

④改革开放以来我国在政治、科技和体育方面取得了重大成就，各举出一个事例。

    政治：                                                                                                                                             

    科技：                                                                                                                                             

    体育：                                                                                                                                             

阅读理解

     People turn to magic (魔力) chiefly as a form of insurance-that is, they use it along with actions that

actually bring results.For example, hunters may use a hunting charm (咒语). But they also use their

hunting skills and knowledge of animals. The charm may give hunters the extra confidence they need to

hunt even more successfully than they would without it.If they shoot a lot of game (猎物), they credit

the charm for their success. Many events happen naturally without magic. Crops grow without it, and

sick people get well without it.But if people use magic to bring a good harvest or to cure a patient, they

may believe the magic was responsible.

     People also tend to forget magic's failures and to be impressed by its surface successes. They may

consider magic successful if it appears to work only 10 per cent of the time. Even when magic fails,

people often explain the failure without doubting the power of the magic. They may say that the magician

made a mistake in reciting the spell or that another magician cast a more powerful spell against the

magician.

     Many anthropologists (人类学家) believe that people have faith in magic because they feel a need to

believe in it. People may turn to magic to reduce their fear and uncertainty if they feel they have no

control over the outcome of a situation. For example, farmers use knowledge and skill when they plant

their fields. But they know that weather, insects, or diseases might ruin the crops. So farmers in some

societies may also plant a charm or perform a magic rite to ensure a good harvest.

1. From the passage, we can learn that the writer of the passage may be________.

A. a hunter      

B. a farmer

C. a magician  

D. an anthropologist

2. Which of the following can best serve as the title of the passage?

A. Magic and Hunting

B. Magic and Farming

C. Why Magic Works?

D. Why People Believe in Magic?

3. The underlined word "spell"( Paragraph 2 ) most likely means________.

A. magic words  

B. magic events

C. words or expressions  

D. magicians

4. People believe in magic because________.

A. magic powers are greater than natural powers

B. magic can turn dreams into reality

C. they are not sure of themselves

D. magic can bring good results

5. Which of the following statements is NOT true according to the passage?

A. Even though magic fails, believers in magic will explain the reason.

B. Believers in magic usually overstate the power of magic.

C. People use magic to reduce their uncertainty and give them extra confidence.

D. Magic can solve problems people can't deal with in a natural way.

请画出减顶油出装置流程。

声波有多种表示方法，常用的有数学公式、（）或者（）等。