下列是对定量订货法描述的是( )。A．订货间隔期变化 B．随时进行货物库存状况检查和

Should teenagers help their parents do chores? Is it important for us to learn how to do chores?

I have a classmate called Li Ting. She is the only child in her family. Her parents love her so much that they don’t let her do any chores. On weekdays she gets up, has meals, goes to school, has lessons, she only plays with her friends. So she doesn’t know how to do chores. One day, her father was badly ill and was in hospital. Her mother had to take care of her father in the hospital and couldn’t cook meals for her for a week. Li Ting didn’t know how to cook meals. She had a lot of trouble cooking meals and often felt hungry. She only had instant noodles(方便面)for her meals.

From the story, we know it’s very important for us to learn to do chores.

小题1:How many children are there in Li Ting’s family?

A．Two.

B．Three.

C．One.

D．Four.小题2:The writer thinks it is________ for teenagers to learn to do chores.

A．wrong

B．important

C．interesting

D．boring小题3: Li Ting doesn’t__________.

A．do chores on weekends

B．go to school on weekdays

C．do her homework on weekdays

D．have meals on weekends小题4: Why did Li Ting only have instant noodles for her meals when her parents weren’t at home?

Her parents didn’t give her enough money.

B. She couldn’t cook meals.

C. She liked eating instant noodles very much.

D. She didn’t enjoy doing any chores.

小题5:Which of the following is NOT true?

A．Li Ting’s grandmother looked after her when her father was in hospital.

B．Li Ting couldn’t do any chores.

C．Li Ting’s parents love her very much.

D．Li Ting was often hungry when her father was in hospital.

下列说法正确的是

A．本初子午线是地球仪上最长的经线

B．0°经线东侧为西经，西侧为东经

C．180°经线是东西半球的分界线

D．向东数值递减的是西经

有机物X、Y、Z都是芳香族化合物，X与Z互为同分异构体，Y的分子式为C₉H₈O，试完成下列问题。

（1）X是一种重要的医药中间体，结构简式为，X可能发生的反应有____________________。

a.取代反应              b.消去反应             c.氧化反应             d.水解反应

（2）有机物Y有如下转化关系：

其中Y不能跟金属钠反应；A能跟NaHCO₃溶液反应，能使溴的四氯化碳溶液褪色，且苯环上只有一个取代基。

Y的结构简式为______________或______________。

（3）Z可由A经一步反应制得。

①Z的结构简式为______________或______________。

②Z有多种同分异构体，其中属于饱和脂肪酸的酯类，且苯环上只有一个侧链的同分异构体有______________、______________、______________、______________。

在Word中，一般情况下将文档中原有一些相同的字（词）串内容换成另外的内容，下列四种方法中最方便的是（）

A.重新输入

B.复制

C.另存

D.替换

特许设立原则