问题 单项选择题

通过提高前后工序生产的均衡化程度,()维持前后工序不平衡的在制品所对应的看板数。

A.提高

B.均衡

C.减少

D.动态

答案

参考答案:C

阅读理解

Everyone needs friends. There is an old saying: Friends are God’s way of taking care of us. But how do you find real friendship and keep it?

“The Care and Keeping of Friends” by American author Sally Seamans tells young students some smart ways to find friends.

Sally says finding friendship is just like planting a tree. You plant the seed and take care of it to make it grow.

First, you should choose a friend. What makes a good friends? It is not because a person has money or good looks. A good friend should be kind and patient. For example, if you have a bad day, a good friend should listen to your complaints(抱怨) and do their best to help. To make a friend, you cannot be too shy. You should make each other happy and share your lives.

But things cannot always be happy. Even the best friends have fights. What should you do when you have a fight with your friend? You have to talk to them. When there is no one around, have an honest talk. If he or she doesn’t want to talk, you could write a letter.

Sally says there are three steps to being friends again: Tell him or her how you are feeling; say what your friend has done wrong, and explain why you did this or that. The book also has advice on some small but important things like celebrating your friends’ success.  Even if you haven’t had a real friend before, you will start to think of having one if you read this book. Because the book tells that friendship is the most important thing in your life.

小题1:The writer of the text really wants to tell us________.

A.life is great if we have friends

B.an old saying

C.Sally Seamans is an American writer

D.God’s way of taking care of us小题2:“The Care and Keeping of Friends” is_______.

A.the word of the God

B.a way of making good friends

C.the name of a book by Sally

D.a story from a newspaper小题3:A good friend should_______.

A.have a lot of money

B.have good look

C.be kind and patient

D.listen to you小题4:Good friends will_______.

A.always be happy

B.do their best to help you

C.never do wrong

D.not have a fight小题5:What can’t you do if your good friend has done wrong?

A.Write a letter to him.

B.Have an honest talk with him.

C.Tell him or her your feeling.

D.Have a fight with him.

实验题

某化学实验活动小组的同学为了探究实验室中久置的氢氧化钠固体的成分,进行了有关实验。参与他们进行的探究活动:

【提出问题】久置氢氧化钠固体的成分是什么?

【猜想与假设】

猜想Ⅰ:全部是NaOH;

猜想Ⅱ:全部是Na2CO3;  猜想Ⅲ:                       

【实验与探究】

(1)分析:暴露在空气中的氢氧化钠会变质,变质原因是(用化学方程式表示)______________________

(2)实验如下:

实验操作步骤实验现象结论及解释
步骤一:取少量固体样品于试管中,加蒸馏水完全溶解,然后加入足量的_________。实验过程中始终没有气泡产生。 

则证明猜想     成立。

步骤二:另取少量固体样品于试管中,加蒸馏水完全溶解,然后滴加氯化钡溶液。 

实验过程中产生          

                        

则证明猜想Ⅱ或Ⅲ成立。此过程中发生反应的化学方程式为                 

_____________________

 

(3)为了进一步的验证猜想结果,小明同学提出如下实验方案:继续步骤二的实验,过滤,然后向滤液中滴加无色酚酞试液,若酚酞变红,则猜想_________成立;若酚酞不变红,则猜想______成立。

小华同学立即对小明同学的方案提出了质疑,通过查阅资料知道,氯化钡溶液呈中性,不能使无色酚酞试液变红,但碳酸钠溶液呈             性(填“酸”或“碱”),能使酚酞变红,因此他认为该方案的操作步骤中应该改进的是