At the end of my senior year of high school, I got a job working at a local coffee shop．I thought the job would be easy and stress-free．I pictured myself pouring the best coffees, making delicious doughnuts (炸面包圈), and becoming friends with regular customers．
I wasn’t expecting the people with enormous orders, the women who complained that the coffee was much too creamy (含乳脂的), or the men who wanted their iced coffees remade again and again until they reached perfection．I couldn’t seem to please anyone．
One rainy day, one of my regular customers came in looking upset．He said he felt like getting in bed, pulling the sheets up over his head, and staying there for a few years．I knew exactly how he felt．
Before he left, I handed him a bag along with his iced coffee．He was surprised, since he hadn’t ordered anything but coffee．I had given him his favorite type of droughnut．
“It’s on me,” I told him．“Have a nice day．”
He smiled and thanked me before heading back out into the rain．
The next day, it was still raining．I spent my afternoon hanging out the window handing people their orders．I was completely wet and freezing cold．Worse, no one was tipping that day．Every time I looked into our empty tip jar, I grew more depressed．
In the evening, the customer from the day before drove up to the window．He handed me a pink rose and a note．He said that not many people took time to care about others and he was glad there were still people like me in the world．With a friendly wave, he drove away．
I ran to the back of the shop and read the note．It read:
Christine,
Thanks for being so sweet, kind and thoughtful yesterday．It is so nice to meet someone who’s indeed nice．Please don’t change your ways! Have a great day! –Hank
After that, whenever I felt depressed or sick of coffee, I thought of Hank and his kindness．Then I would smile, hold my head up high, clear my throat and ask politely, “How can I help you?”
45．Why wasn’t the writer happy with her job at first?
A．The customers didn’t tip her enough．
B．It was difficult to make iced coffee perfect．
C．Everybody had an enormous order．
D．The job didn’t turn out as she had expected．
46．The man came to the coffee shop to ______．
A．buy his favorite doughnut B．complain to the author
C．buy a cup of iced coffee D．get out of the rain
47．The man felt thankful for the writer because ______．
A．she was indeed kind to him in a time of need
B．she knew exactly how the man felt
C．she offered him coffee and food for free
D．she comforted him by sharing his pain
48．What can we learn from the passage?
A．Don’t count your eggs until they are hatched．
B．If you light a lamp for somebody, it will also brighten your path．
C．The quality of your life is the quality of your relationships．
D．A man is happy so long as he chooses to be happy．
实验中有NO产生，则在D中可观察到的现象是 ；
， 。（填操作名称）