问题 阅读理解

阅读理解。

     Peter is thirteen years old. He is in Grade Two this year. He likes to play football and watch football

matches. And he often reads newspapers. He does his best to know when and where there is going to

be a football match. Now Peter is having lunch. He is listening to the radio (收音机), too. He is very

happy because there is going to be a football match this afternoon. But he has to have English and

Chinese lessons. He thinks hard and finds a way.

     "Hello, Mrs. Black,"Peter says to his teacher on the telephone. "Peter is ill in bed. He wants to ask

for (请假) half a day's leave (休假)."

     "Oh, I'm sorry to hear that," says Mrs. Black. "But who is that?"

     "It's my father, Mrs. Black," says Peter.

1. Peter is a _________.

A. middle school student          

B. Young Pioneer        

C. worker                      

D. teacher

2. Peter will be in _________.

A. Grade Two    

B. Grade Three    

C. Grade One      

D. school

3. Peter often reads newspapers because _________.

A. he likes to read news

B. he likes to read stories

C. he wants to know when and where a football match will be

D. his father wants him to read them

4. Peter wants to ask for half a day's leave because _________.

A. his father is ill in bed      

B. he wants to watch the football match      

C. he doesn't want to be have English and Chinese lesson        

D. he is ill in bed

5. Which of the following is TRUE?

A. Mrs. Black is going to take Peter to see s doctor.        

B. Peter likes to read newspapers at five in the afternoon.        

C. Peter is a stupid (愚笨的) teacher.      

D. Peter is not an honest (诚实的) boy.                               

答案

1-5 ABCBC

填空题

联碱法(候氏制碱法)和氨碱法的生产流程简要表示如下图:

(1)两种方法的沉淀池中均发生的反应化学方程式为_____________________________。

(2)若沉淀池含800.00 mol NH3的水溶液质量为54.00 kg,向该溶液通入二氧化碳至反应完全,过滤,得到滤液31.20kg,则NH4HCO3的产率为______________%。

(3)在氨碱法生产过程中氨要循环使用,但不需要补充,在母液中加生石灰前先要加热的原因是  ___

(4)根据联碱法中从滤液中提取氯化铵晶体的过程推测,所得结论正确是_______(选填编号)。

a.常温时氯化铵的溶解度比氯化钠小 

b.通入氨气能增大NH4+的浓度,使氯化铵更多析出

c.加入食盐细粉能提高Na+的浓度, 使NaHCO3结晶析出

d.通入氨气能使NaHCO3转化为Na2CO3,提高析出的NH4Cl纯度

(5)联碱法相比于氨碱法,氯化钠利用率从70%提高到90%以上,主要是设计了循环Ⅰ,联碱法的另一项优点是__________________________________________________。

(6)从沉淀池析出的晶体含有NaCl杂质,某同学在测定其NaHCO3的含量时,称取5.000g试样,配制成100mL溶液,用标准盐酸溶液滴定(用甲基橙做指示剂),测定数据记录如下:

滴定次数待测液(mL)0.6000mol/L盐酸溶液的体积(mL)
初读数终读数
第一次  20.001.0021.00
第二次  20.00如右图Ⅰ如右图Ⅱ
 

①第二次滴定,从图Ⅰ图Ⅱ显示消耗的盐酸溶液体积为               

②该实验测定NaHCO3含量的计算式为ω(NaHCO3)=                          

③该同学测定结果有一定的误差,产生该误差的原因可能是        (选填编号)。

a.待测液中加入甲基橙作指示剂,用标准酸液滴定至变橙色

b.锥形瓶用蒸馏水洗涤后,直接加入待测溶液进行滴定

c.滴定管用蒸馏水洗涤后,直接注入标准酸液进行滴定

d.滴定管用蒸馏水洗涤后,直接注入待测液,取20.00 mL进行滴定

单项选择题