现有X、铜、镉（Cd）三种金属，把X和镉分别放入硫酸铜溶液中，过一会儿，发现镉表
题型：选择题
问题：
现有X、铜、镉（Cd）三种金属，把X和镉分别放入硫酸铜溶液中，过一会儿，发现镉表面有一层红色物质析出，而X表面没有变化，则X、铜、镉的金属活动性顺序为
A．X＞铜＞镉
B．铜＞镉＞X
C．镉＞铜＞X
D．镉＞X＞铜
题型：选择题
A passenger told an air hostess that he 
needed a cup of water to take his medicine when the plane just took off．She told him that she would bring him the water in ten minutes．
Thirty minutes later, when the passenger's ring for service sounded, the air hostess flew in a flurry．She was kept so busy that she forgot to deliver him the water．As a result, the passenger was held up to take his medicine．She hurried over to him with a cup of water, but he refused it．
In the following hours on the flight, each time the stewardess passed by the passenger she would ask him with a smile whether he needed help or not. But the passenger never paid any attention to her.
When he was going to get off the plane, the passenger asked the air hostess to hand him the passengers’ booklet (意见簿). She was very sad. She knew that he would write down sharp words, which might result in the loss of her job. But with a smile she handed it to him.
Off the plane, she opened the booklet, and cracked a smile, for the passenger put it, “On the flight, you asked me whether I need help or not for twelve times in all. How can I refuse your sincere smiles?”
That’s right! Who can refuse your twelve sincere smiles from a person?
小题1:What does the underlined sentence in Paragraph 2 mean?
A．The air hostess forgot the passenger’s need on purpose.
B．The air hostess suddenly realized that trouble was coming.
C．The passenger wasn’t angry at being ignored.
D．The passenger was refused to be served.小题2:According to the passage, which of the following is TRUE?
A．The passenger refused to take his medicine.
B．The passenger set down his anger in the booklet.
C．The words in the booklet would never affect the air hostess.
D．The hostess finally moved the passenger with her smile.小题3:What kind of person do you think the passenger is?
A．Forgiving.
B．Curious.
C．Sharp.
D．Enthusiastic.小题4:As a result, the air hostess would .
A．get fired by her company
B．be hired by the passenger
C．keep her job
D．get a promotion