阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

A

    Suppose you're in a rush, felling tired, not paying attention to your screen, and you send an email that could get you in trouble.

    Realisation will probably set in seconds after you've clicked “send”. You freeze in horrors and burn with shame.

    What to do? Here are four common email accidents, and how to recover.

    Clicking “send” too soon

    Don't waste your time trying to find out if the receivers has read it yet. Write another email as swiftly as you can and send it with a brief explaining that this is the correct version and the previous version should be ignored.

    Writing the wrong name

    The sooner you notice, the better. Respond quickly and briefly, apologizing for your mistake. Keep the tone measured: don't handle it too lightly, as people can be offered, especially if your error suggests a misunderstanding of their culture(i.e. incorrect ordering of Chinese names).

    Clicking “reply all” unintentionally

    You accidentally reveal(透露)to entire company what menu choices you would prefer at the staff Christmas dinner, or what holiday you'd like to take. In this instance, the best solution is to send a quick, light-hearted apology to explain your awkwardness. But it can quickly rise to something worse, when everyone starts hitting “reply all” to join in a long and unpleasant conversation. In this instance, step away from your keyboard to allow everyone to calm down.

    Sending an offensive message to its subject

    The most awkward email mistake is usually committed in anger. You write an unkind message about someone, intending to send it to a friend, but accidentally send it to the person you're discussing. In that case, ask to speak in person as soon as possible and say sorry. Explain your frustrations calmly and sensibly—see it as an opportunity to clear up any difficulties you may have with this person.

平静的湖面上倒映着美丽的白塔，在这里，‘倒映的白塔’是（  ）

Fred Astaire was born in Nebraska in 1899. Fred and his sister, Adele, learned to dance when they were very young. Their mother took them to New York to study dance. They performed in their first professional（专业的） show when Fred was ten years old and Adele was twelve. Later, as teenagers, the two danced in many shows throughout the United States. Their first big success was on Broadway in 1917.
The Astaires as they were known quickly became Broadway stars. During the nineteen twenties, they sang and danced in eleven different shows. They also performed in England. In 1932, Adele Astaire married a British man, and stopped performing. But Fred did not forego his dream. He would go on alone, in the movies.
Fred Astaire had the best skill among all dancers in history. He danced up walls and on the ceiling in the film Royal Wedding. He danced on rooftops in The Belle of New York. He danced on roller skates in Shall We Dance?
Fred Astaire made all this look easy. But it was not. He said: "Dancing is a sweaty job. You cannot just sit down and do it. You have to get up on your feet. It takes time to get a dance right, to create something memorable. I always try to get to know my dance so well that I do not have to think."
In 1949, Fred Astaire won a special award for his film work from America's Motion Picture Academy. He also won awards from the television industry for a number of his television programs.
Fred stopped dancing in 1970. He was more than seventy years old at the time. He said a dancer could not continue dancing forever. He said he did not want to disappoint（使失望） anyone, even himself. He danced again in public only once after that. It was with another great male dancer, Gene Kelly, in the movie "That's Entertainment, Part Two".
Fred Astaire and his first wife, Phyllis, had three children. Phyllis died in 1954. Twenty-five years later, Fred married race horse rider Robyn Smith. Fred Astaire died on June 22, 1987. He was eighty-eight years old. He was called the greatest dancer in the world. His dancing was called perfect. And moviegoers everywhere will remember him as a great performer whose work will live forever in his films.

七年级探究性学习小组的同学在学习了《生物圈中的绿色植物》相关知识后，利用课余时间，用银边天竺葵作实验材料，对“绿色植物进行光合作用”实验作了进一步探究．请根据以下图示，回答下列问题．