阅读理解。
John was ten years old and he was very lazy. He had to go to school, of
course, but he was bored there and tried to do as little work as possible. His father and mother were
both doctors and they hoped that he would become one, too, when he grew up. But one day John
said to his mother, "When I finish school, I want to become a garbage collector."
"A garbage collector?" his mother asked .She was very surprised. "That's not
a pleasant job. Why do you want to become a garbage collector?"
"Because then I'd only have to work one day a week," John answered.
"Only one day a week?" his mother said, "What do you mean?"
"Well," John answered, "I know that the ones who come to our house only
work on Wednesday, because I only saw them on that day."
1. John_____at school.
A. didn't do any work
B. did much work
C. did very little work
D. tried to finish his work
2. John's parents wanted him to become______.
A. a garbage collector
B. a doctor
C. a teacher
D. a worker
3. John hoped to be a garbage collector because______.
A. he knew it was an important and necessary job
B. he thought he would work only one day a week
C. he often saw some garbage collectors come to his house
D. the garbage collectors really work only one day a week
4. John thought that the garbage collectors only work one day a week because ______.
A. it was a rule
B. some garbage collectors told him so
C. his parents told him so
D. he saw them work only on Wednesday
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下列各项中。对作品故事情节的叙述不正确的一项是( )
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二氧化硒(SeO2)是一种氧化剂,其被还原后的单质硒可能成为环境污染物,通过与浓HNO3或浓H2SO4反应生成SeO2以回收Se.完成下列填空:
(1)Se和浓HNO3反应的还原产物为NO和NO2,且NO和NO2的物质的量之比为1:1,写出Se和浓HNO3的反应方程式______.
(2)已知:Se+2H2SO4(浓)→2SO2↑+SeO2+2H2O;2SO2+SeO2+2H2O→Se+2SO42-+4H+则SeO2、H2SO4(浓)、SO2的氧化性由强到弱的顺序是______.
(3)回收得到的SeO2的含量,可以通过下面的方法测定,测定的原理如下:反应①发生后产生的I2,I2的量在反应②中被滴定,淀粉为指示剂,以Na2S2O3溶液为标准溶液
①SeO2+KI+HNO3→Se+I2+KNO3+H2O
②I2+2Na2S2O3→Na2S4O6+2NaI
实验中,准确称量SeO2样品0.2500g,消耗了0.2000mol/L的Na2S2O3溶液25.00mL,所测定的样品中SeO2的质量分数为______.
下图中的哪一个代表了买入看涨期权的盈亏()
A.
B.
C.
D.
在“微软拼音输入法”中,结束一句话输入可按()键。
A、空格
B、逗号
C、句号
D、Esc
E、回车
接待处理投诉所注重的几个关键环节是什么?