生产作业前要认真执行检查确认制，检查确认的主要内容包括：（）。A、工作对象有无危险因

The practice of magic includes special words, actions, and objects. Most magic involves a person called a magician, who claims to have supernatural powers. Magic words.

To work most magic, the magician sings or speaks special words in a certain order. These words are called incantations or spells. Some spells form prayers to demons(魔鬼), spirits, or other supernatural forces. Many societies believe the magic will not work unless the magician recites the spells perfectly. Other magic words have no meaning, though they supposedly possess power when spoken by a magician. Magic actions accompany the words spoken in performing much magic. Many of these movements act out the desired effect of the magic. For example, a magician trying to make rain fall may sprinkle(洒) water on the ground. The magician's combined words and actions form a ceremony. Magic objects include certain plants, stones, and other things with supposed supernatural powers. Any such object may be called a fetish(物神). But this term often refers to an object—for example, a carving or a dried snake—honored by a tribe for its magic powers. Many tribes believe fetishes have magic power because spirits live in these objects. Many people carry magic objects called amulets(护身符)to protect themselves from harm. Many amulets are stones or rings engraved(雕刻) with magic symbols.

The magician, in some societies, nearly everyone knows how to work some magic. In other societies, only experts practice magic. Magicians may be called medicine men, medicine women, shamans, sorcerers, or witch doctors. In many societies, magicians must inherit(遗传) their powers. In others, any person may become a magician by studying the magical arts.

Many societies believe magicians must observe certain rules and taboos (forbidden actions) for their spells to work. For example, they may be required not to eat various foods or to avoid sexual activity for a certain period before the ceremony.

小题1:What do magic words mean to people in some society?

A．They have the power to kill devils.

B．They have power if magician recites the right spells.

C．They have no effect at all.

D．They can be used whenever they want.小题2:Why do many people believe in a fetish?

A．Because it is often a ring which is worth a lot of money.

B．Because it is carved with magic symbols.

C．Because people think spirits live in it.

D．Because it can help them with many things.小题3:What's the best title of the passage?

A．How Magicians make Magic Work

B．The Power of Magic

C．How to Practice Magic

D．The Choice of Magicians

循环流化床锅炉空气预热器漏风有何危害，应如何处理？

政策性调查研究包括：为领导制定政策调查研究；（）；为完善政策调查研究.

禁忌使用鼻饲法的病员是（）。

A.昏迷

B.口腔手术

C.破伤风

D.人工冬眠

E.食道静脉曲张者

多根牙的抗力中心在（）

A．以上都不对

B．根分叉附近向根尖方向3～4mm

C．根分叉附近向验方1～2mmn

D．根分叉附近向根尖方向1～2mm

E．根分叉附近向牙合方2～3mm