氯丙嗪治疗精神病时最特征性不良反应是A．体位性低血压 B．过敏反应 C．内分泌反应

阅读理解。

    How men first learnt to invent words is unknown; in other words, the origin (起源) of language is a

mystery. All we have really known is that men, unlike animals, somehow invented certain sounds to express

thoughts and feelings, actions, and the things, so that they would communicate with each other; and that

later they agree upon certain signs, called letters, which could be combined (结合) to represent those sounds,

and which could be written down. These sounds, whether spoken or written in letters, are called words. The

power of words, then, lies in their associations (交际)-the things they bring up before our minds. Words

become filled with meaning for us by experience; and the longer we live, the more certain words recall to us

the glad and sad events of our past; and the more we read and learn, the more the number of words that mean

something to us increases. Great writers are those who not only have great thoughts but also express these

thoughts in words which appeal (具有感染力) powerfully to our minds and emotions (情感). This charming

and telling use of words is what we call literary (文字) style. Above all, the real poet is a master of words. He

can convey (转达) his meaning in words which sing like music, and which by their position and association

can move men to tears. We should therefore learn to choose our words carefully and use them correctly, or

they will make our speech silly and vulgar (粗俗的).

1. According to the writer of the passage, ______. [ ]

A. men, as well as animals, invented certain sounds to express thoughts

B. the origin of language is a difficult question

C. words did not have written form at first

D. words came from sounds

2. In order not to make our speech silly and vulgar, we should ______.[ ]

A. use words that can move men to tears

B. choose words with care and accuracy (正确)

C. become a master of words

D. use words which sing like music

3. The best title for this passage would be ______. [ ]

A. The Meaning of Words

B. The Nature of Words

C. The Invention of Words

D. The Power of Words

右图为短周期的一部分，推断关于Y、Z、M的说法正确的是（   ）

A．非金属性：Y＞Z＞M

B．ZM₂分子各原子均满足8e^-稳定结构

C．原子半径：M＞Z＞Y

D．Y离子的结构示意图可表示为：

教师如何激发和培养学生的学习动机？