墨子和他的学生结成了一个组织严密的团体，团体首领称为（）A、领袖 B、“巨子” C、大匠

找规律写数。

（1）15、（    ）、（    ）、18、（    ）、（    ）。

（2）17、16、（    ）、（    ）、（    ）、12、（    ）。

依据甲、乙、丙三图回答下列问题：

(1)甲装置为__________，乙装置为__________，丙装置为__________。

(2)甲、乙装置中，锌极上分别发生__________反应、__________反应。

(3)乙装置中，Cu^2＋浓度__________。

实验员小周在学期末整理实验仪器时发现有一瓶标签模糊的溶液，如下图．

请你和小周一起探究该溶液的成分，并测定其质量分数．

第一步：猜想并验证该溶液的溶质是什么．

猜想：根据标签可知，这瓶溶液可能是HCl、KCl、NaCl等

含有氯离子的酸或盐．

验证：

步骤	现象	结论
取样，滴加紫色石蕊	溶液变成______色	这瓶溶液是盐酸

第二步：测定该溶液的溶质质量分数

实验原理：（1）用已知浓度的氢氧化钠溶液和盐酸反应，反应的化学方程式为：

NaOH+HCl=NaCl+H₂0

（2）当盐酸和氢氧化钠恰好完全反应时，再增加一滴氢氧化钠溶液，溶液就呈碱性（可以使无色酚酞变成红色），而一滴氢氧化钠溶液的体积约为0.05mL，对测定结果的影响很小，可忽略不计．

实验步骤：（1）取未知浓度的盐酸20g倒入烧杯中，向其中滴加2滴无色酚酞溶液．此时溶液呈______色．

（2）量取质量分数1%的氢氧化钠溶液50mL（密度近似为1.0g/mL），用胶头滴管逐滴滴加该氢氧化钠溶液到盐酸中，观察到______，停止滴加，剩余氢氧化钠溶液的10mL．

数据处理：计算该盐酸溶液的溶质质量分数．

实验反思：小周在做实验的时盛放待测盐酸的烧杯（实验步骤中加点的烧杯）在装入盐酸前内壁附着较多水，用该烧杯完成上述实验会导致结果______（填“偏大”“偏小”或“无影响”）．

There are many fun, free activities that you can do as a family. All that is required is a bit of imagination and some time. And the best part is that these are the kind of fun, family memories a child will remember for a lifetime.

Family Game Night

Kids often get games for Christmas or birthdays, and would love to have a chance to play with their family. Or, make up some games of their own. Charades（字谜游戏）is a fun game that will challenge children to use their imagination. Divide the family into teams and let each team come up with words and the other has to act out.

Family Art Time

Pick some time for the family to sit down and come up with their own art. It doesn’t need to be just a drawing－take some old magazines, let the kids cut out pictures and paste them into their own shape. Or let them use leaves, branches and whatever else they can find to make something from their imagination.

Family Picnic

Taking the family for a picnic is a great way for some fun that doesn’t cost any money. If the weather is nice, take them to a park or playground and let them have a day of playing.

Family Field Trip

A family field trip doesn’t have to cost a cent. Ask a nearby farm if you can bring your kids out for a tour and to see some of the animals. Or take them to a park to find certain items from nature. Ask a local business if you could bring the family for a tour to see how things work－you might be surprised at the number of people who would be excited to share what they do with others, and it could be an interesting lesson for kids.

小题1:When playing the game charades, kids are supposed to ______.

A．prepare some cakes for each other

B．sing a song for each other in turn

C．connect actions with certain words

D．be quick to follow others’ actions小题2:Which activities in the passage depend much on the kids imagination?

A．Family Game Night ＆ Family Art Time

B．Family Game Night ＆ Family Picnic

C．Family Picnic ＆ Family Field Trip

D．Family Field Trip ＆ Family Game Night小题3:It can be inferred from the last paragraph that ______.

A．you may share your own experience with workers

B．It costs a lot to visit a park for a family

C．all the people will be excited to share what they have with you

D．you should ask for permission from the farm owner小题4:The passage is mainly intended for ______.

A．teachers

B．teenagers

C．tourists

D．parents

确诊一氧化碳中毒的主要依据是

A．血液中还原血红蛋白量大于50 g/L
B．血液中还原血红蛋白量大于70 g/L
C．血液胆碱酯酶活性降低
D．血液检查碳氧血红蛋白定性阳性
E．血液中氧分压降低