南雅中学的小贝同学取4个瓶子,均加入等量干酵母（内有活的酵母菌）,一起放置在温暖环境中.（如图 A.加葡萄糖和水 B.加

解题思路：在化学反应里能改变其他物质的化学反应速率，而本身的质量和化学性质在反应前后都没有发生变化的物质叫做催化剂（又叫触媒）．要探究一种物质能否作为化学反应的催化剂，一般要注意从三个方面入手进行：一是探究加入该物质能否改变化学反应速率；二是探究反应前后该物质的质量是否改变；三是探究化学反应前后该物质的化学性质是否改变．

[实验验证]
通过实验一探究CuO对过氧化氢分解速率的影响．实验1的步骤是：将带火星的木条伸入装有过氧化氢溶液的试管中，带火星的木条不复燃，可见常温下过氧化氢分解速率很慢．然后在装有过氧化氢溶液的试管中加入少量CuO，带火星的木条复燃，可见，CuO能加快过氧化氢的分解速率．但不能说CuO就是过氧化氢的催化剂．只有CuO具备既能改变化学反应速率，其质量和化学性质在反应前后又保持不变，才能作为过氧化氢分解的催化剂．
[实验验证]在试管中加入5mL的10%过氧化氢溶液，再加入1g二氧化锰粉末，此时溶液剧烈地冒出大量气泡，放出大量的热，实验现象说明10%过氧化氢溶液放出气泡的速率比5%过氧化氢溶液要快；
故答案为：常温下过氧化氢分解速率很慢；CuO能加快过氧化氢的分解速率；化学性质；在试管中加入5mL的10%过氧化氢溶液，再加入1g二氧化锰粉末；快．

点评：
本题考点： 催化剂的特点与催化作用；氧气的检验和验满．

考点点评： 催化剂的特点可以概括为“一变二不变”，一变是能够改变化学反应速率，二不变是指质量和化学性质在化学反应前后保持不变．要探究一种物质能否作为化学反应的催化剂，必须同时具备上述特点．

是（二）生物第一卷
选择题C A B D B A D B B B D D A B C A C B A D B A D C C B
二卷
选择题 B A C C C A B C C B A A B C C C B A A A C C B B
三卷
B A A B C B C B A D A D A C B A D D C C A A D B A C
四卷
C A B B B A C C A B D D A B D B B A C C D C A D

我是南雅的高一学生
哈哈哈
好像插班生要交建校费
2500每个学期
然后学费3000左右
还有一些杂费之类的~一共6000多吧
你要插到哪个班去哈?

National Day of the long history and goes back to ancient times.Therefore,the basis for the rest of the world have established the National Day bizarre.According to statistics,countries all over the world to establish the time of the country's National Day 35.China to the founding of the National Day on October 1,1949.Occupying the capital of the day as the National Day of Cuba,Cambodia,the Czech Republic and Slovakia.Some of the country's Independence Day as the National Day of the country.January 1,1804,the Haitian people annihilated the Napoleonic expedition to the 60,000 troops in Port-au-Prince to declare independence,and thus put to the annual National Day on January 1.Mexico,Ghana and other countries as well.Some countries to the armed intifada anniversary as a national holiday.Romania,the Communist Party led an armed uprising to overthrow the reactionary rule of Antonescu,to the anti-fascist war on August 23,1944 as National Day.France to destroy symbols of the authoritarian period for its National Day.Some countries have a great day as the National Day of the meeting.July 4,1776 the United States adopted the "Declaration of Independence" mainland date for the National Day.Canada is July 1,1867 the British Parliament passed the "British North America Act" that day as the National Day.Japan is the birthday of Emperor Hirohito of Japan for the National Day.There is the head of state's birthday a national holiday,Nepal,Thailand,Sweden,the Netherlands,Denmark,Belgium and other countries.