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问题 填空题
3.024的小数点向（　　）移动（　　）位就变成了302.4；______缩小到它的
1
1000
是1.05．
答案

3.024的小数点向右移动两位就变成了302.4；

把1.05扩大1000倍，只要把它的小数点向右移动三位，1.05×1000=1050．

故答案为：右，两，1050．

填空题

做铁丝在氧气中燃烧的实验里，集气瓶底炸裂，这是因为： ______________，有关反应的文字表达式为                    。
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单项选择题

One’s style of the dress reveals the human obsession with both novelty and tradition. People use clothing to declare their membership in a particular social group; however, the rules for what is acceptable dress for that group may change. In affluent societies, this changing of the rules is the driving force behind fashions. By keeping up with fashions, that is, by changing their clothing style frequently but simultaneously, members of a group both satisfy their desire for novelty and obey the rules, thus demonstrating their membership in the group.　　There are some interesting variations regarding individual status. Some people, particularly in the West, consider themselves of such high status that they do not need to display it with their clothing. For example, many wealthy people in the entertainment industry appear in very casual clothes, such as the worn jeans and work boots of a manual laborer. However, it is likely that a subtle but important signal, such as an expensive wristwatch, will prevail over the message of the casual dress. Such an inverted status display is most likely to occur where the person’s high status is conveyed in ways other than with clothing, such as having a famous face.

Why does the author discuss individual status in paragraph 2

A．To state that individuals status is not important in the West

B．To argue that individuals need not obey every fashion rule

C．To contrast the status of entertainers with that of manual laborers

D．To explain how high status may involve an inverted status display
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