下列物质的鉴别方法中正确的是（ ）
| A．MnO2和木炭——观察颜色 |
| B．CO2和N2——燃着的木条分别伸入瓶中 |
| C．Ca（OH）2溶液和稀盐酸——取样，滴加碳酸钠溶液 |
| D．NaOH溶液和Na2CO3溶液——取样，滴加酚酞试液 |
A young woman carrying a three-year-old child got on a bus. The conductor hurried to give her a warm welcome and then kindly asked the other passengers to make more room for the woman and her child. On seeing this, people began to talk. "You know this conductor used to be very rude. Now suddenly he has changed his bad behavior, "said a middle-aged man.
"Yes, he should be praised and we must write a letter to the company," said a second passenger. "That's right," another lady said, "I wish a newspaper reporter were here so that more people could learn from this conductor.”
Just then a gentleman who looked like a teacher turned to the conductor and said, "Excuse me, but can I know your name, please? Your excellent service must be praised..."
Before he could open his mouth, the three-year-old child sitting on the young woman's lap interrupted, "I know his name. I call him Dad."
【小题1】
One passenger suggested writing a letter to the company to ______ .
【小题2】
What was the gentleman?
【小题3】
. The word "he" in the last paragraph refers to _______.
【小题4】
It is clear from the story that the conductor _______.
"Yes, he should be praised and we must write a letter to the company," said a second passenger. "That's right," another lady said, "I wish a newspaper reporter were here so that more people could learn from this conductor.”
Just then a gentleman who looked like a teacher turned to the conductor and said, "Excuse me, but can I know your name, please? Your excellent service must be praised..."
Before he could open his mouth, the three-year-old child sitting on the young woman's lap interrupted, "I know his name. I call him Dad."
【小题1】
One passenger suggested writing a letter to the company to ______ .
| A．make a demand for more buses | B． thank the conductor for his good service |
| C．criticize the conductor for his rude behavior | |
| D．invite a newspaper reporter to write about the conductor |
What was the gentleman?
| A．A teacher. | B．A newspaper reporter. |
| C．Not known from the story. | D．The conductor's friend from his company. |
. The word "he" in the last paragraph refers to _______.
| A．the gentleman | B．the conductor |
| C．the middle-aged man | D．the three-year-old child |
It is clear from the story that the conductor _______.
| A．has changed his attitude towards his work |
| B．has now been kind and polite to all passengers |
| C．has not changed his rude behavior to passengers |
| D．has now been kind and polite to women with children |
珠江三角洲曾遭遇“咸潮”，水源中含氯量高达7100mg/L，远远超过正常值250 mg/L。以下说法正确的是（ ）
0 112912 112920 112926 112930 112936 112938 112942 112948 112950 112956 112962 112966 112968 112972 112978 112980 112986 112990 112992 112996 112998 113002 113004 113006 113007 113008 113010 113011 113012 113014 113016 113020 113022 113026 113028 113032 113038 113040 113046 113050 113052 113056 113062 113068 113070 113076 113080 113082 113088 113092 113098 113106 366461
| A．“咸潮”中氯离子浓度可达0.2mol·L—1 |
| B．自来水厂可加入适量AgNO3溶液除去Cl— |
| C．自来水厂可用蒸馏法来净化水 |
| D．直接用“咸潮”水作为水源，对人体无害 |
中，
分别是
的中点，若
，Co则
cm．
中，
分别是
的中点，若
，Co则
cm．
，则该平行四边形的面积为 .