Holidays are not necessarily for fun or rest. Doing something meaningful can also gain special pleasure. When the final bell rang, the students were reminded that there was no school on Monday—the Labor Day. “Enjoy your extra day off” said the teacher to her class.
An extra day off unsuited Kayla just fine. She loved breaks. She wanted to go out to play with her friends. When the school bus dropped Kayla off, she ran into the house happily.
“How was school, Kayla?” asked her mom.
“It was great, Mom. I am excited about no school on Monday.”
“You just started back to school two weeks ago. Already in need of a break, huh?” asked Kayla’s mom with a laugh.
Kayla slept in the next morning. Saturday was her favorite day of the week. I trained most of the day, so Kayla enjoyed playing videogames inside. On Sunday, her friends came over and they played basketball for several hours.
Then it was Labor Day, you know, the extra day off that Kayla was so looking forward to. But Kayla was awakened early that morning by her dad. He told Kayla that in honor of Labor Day, the family would be cleaning both inside and outside the house. Kayla couldn’t believe it. This was a holiday. A day when she was supposed to be enjoying freshly squeezed lemonade while playing in her tree house. As Kayla wiped here yes, she began to wonder if this was just a bad dream.
“Kayla, your breakfast is ready. We have a lot of work to do today. Let’s get a move on,” said Kayla’s mom. As she sat down at the kitchen table, Kayla asked her parents，
“Are you serious about working today? Isn’t Labor Day a holiday?”
“Yes, Kayla. It is,” replied her dad. “But your mom and I thought working hard today would make you appreciate why Labor Day was observed in the first place.”
注意：1.所续写短文的词数应为150左右;2.请按如下格式在答题卡的相应位置作答。
At first Kayla felt disappointed at her parents’ plan for the holiday.
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________But things began to change as she was doing the chores.
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________2 . Who has no regrets about things done in the past? Wouldn’t it be nice if, somehow, we could go back to change a couple of bad decisions? This sounds like science fiction.
The laws of physics prohibit traveling back in time for many reasons. If we did travel back in time and changed the course of events, we would be altering the course of history. An example often cited is the grandfather’s paradox (悖论): If your grandfather died when he was still a high school student, he wouldn’t have met your grandmother and your father and you wouldn’t exist.
Putting humans or consciousness traveling back in time aside for the moment, is there anything in science even similar? Surprisingly, yes. At the level of quantum particles (量子粒子), there is something called Wheeler’s delayed-choice experiments that show that actions in the present can influence the past. The experiments use something called the wave-particle duality (波粒二象性) of light and of matter. The fact that the physical nature of quantum objects is undetermined until it is measured. In other words, this means that a particle of light or of matter can behave either as a wave (spreading out in space) or as a particle (staying together) depending on the measuring devices. Long and ongoing discussions about the nature of quantum physics are still trying to work out what this actually means. Do our minds determine the nature of physical reality?
Should we offer food for thought for the future or the past? Unfortunately, these experiments say very little about how we could interfere with the past in events relevant to the human scale. Better to think carefully about decisions than to try to fix them backwards.
1. What’s the purpose of mentioning the paradox?| A．To show it is interesting. |
| B．To explain Wheeler’s tests. |
| C．To demonstrate time is different from what we have known. |
| D．To show it’s impossible to travel back in time. |
| A．Consciousness traveling back in time was tried in the experiments. |
| B．Different measuring devices have the same result. |
| C．More research is needed in the future. |
| D．These experiments can determine the nature of matter. |
| A．We should focus on the present. |
| B．The future food is more nutritious. |
| C．We can change the past from the experiments. |
| D．It is never too late to make up for mistakes. |
| A．Is changing the past wise? |
| B．Can we change the past? |
| C．Do our minds determine the future? |
| D．Do the laws of physics ban traveling back? |
