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beginner-appropriate version of the Rose Adagio from Sleeping Beauty. As I stood in my living room, balancingshakily and dancing for nobody but myself, I felt every inch a ballerina.24. Why did the author learn ballet in her middle age?A. To provide support to her ballet instructor.B. To cultivate inspiration for her writing career.C. To participate in a personally fulfilling activityD.To demonstrate her continuing physical capabilities.25. How did the author probably feel about ballet as a child?A. Terrified.B. Interested.C. Relieved.D. Determined.26. What kind of person is the author?A. Curious and mild.B. Strict yet indecisive.C. Negative yet honest.D. Determined and open-minded.27. What does ballet teach the author?A. Enjoy the journey of becoming a better self. B. It's acceptable to forgive herself for not trying.C. Physical flexibility comes first for the middle-aged.D. One shouldn't stop striving for personal achievements.CA tiny cooling device can automatically reset faulty components of a quantum computer. Its performance suggests that controlling heat could also enable other autonomous quantum devices.Quantum computers aren't yet fully practical because they make too many errors. In fact, if qubits (量子比特)-key components of this type of computer - accidentally heat up and become too energetic, they can end up in anincorrect state before the calculation even begins. One way toreset the qubits to their correct states is to cool them.Simone Gasparinetti at Chalmers University of Technology in Sweden and his colleagues have assigned thistask to an autonomous quantum “refrigerator" for the first time. The researchers built two qubits and one qutrit (量子三元), which can store more complex information than a qubit, from tiny superconducting circuits. The qutritand one of the qubits formed a fridge for the second target qubit, which could eventually be used for computation. The researchers carefully engineered the interactions between the three components to ensure that when thetarget qubit had too much energy, which caused errors, heat automatically flowed out of it and into the two otherelements. This lowered the target qubit's temperature and reset it. Because this process was autonomous, thequbit-and-qutrit fridge could correct errors without any outside control. Without any significant quantum computerredesign or introduction of new wires, the qubit's starting state was correct 99.97 per cent of the time. In contrast,other reset methods typically onlymanage 99.8 per cent.Michal Horodecki at the University of Gdansk,Poland, says one of the most urgent problems for quantumcomputers built with superconducting circuits is making sure the machines don't heat up and so make errors. “Thefact that this machine is autonomous, so it does not require any external control, should make it efficient andversatile,”says Nicolas Brunner at the University of Geneva in Switzerland. The new experiment opens a path forengines. The researchers are already looking into whether they could build on their experiment. For example, theymight create an autonomous quantum clock or design a quantum computer with other functions automaticallydriven by temperature differences. 28. What is the major problem with quantum computers?A. They lose accuracy as their temperatures rise.B. They exhibit errors even under minimal workloads.高三英语试题第4页共8页