School. "Our findings can play an important role in the present development of medicine that might prevent these undesirable effects and offer understanding of why some people are forgetful or have difficulty keeping the memories."

　　In their study, Baram and her UC Irvine colleagues identified a novel process in which stress caused these effects. They found that, severe stress activated（激活）Corticotropin Releasing Hormones (CRH), which prevented the brain from keeping memory.

　　Memory takes place at synapses, where there are connections through which brain cells communicate. These synapses lie on dendritic spines（神经元）. In rat and mouse studies, Baram's group saw that the release（释放）of CRH in the brain's primary memory center led to the rapid breakup of these dendritic spines, which in turn limited the ability of synapses to collect and store memories.

　　In addition, the researchers reproduced the effects of stress on dendritic spines by keeping low levels of CRH, and watching how the spines ruptured over minutes. "Fortunately, once we removed the CRH, the spines seemed to grow back again," Baram said, "And this study can play a role in the creation of treatments to address stress-related memory loss."

25. According to the text, short-term stress can lead to _______.

A. memory loss B. cell decrease

C. head damage D. thought disorder

26. The underlined word "ruptured" in Paragraph 5 is closest in meaning to _______.

A. came into being B. built up C. broke apart D. died away

27. What is the author's purpose of writing the text?

A. To discuss the main stages of stress.

B. To show the primary cause of stress.

C. To introduce a new finding about stress.

D. To promote an effective treatment for stress.

　　Handwriting, which has developed over ages, is receiving a tech edge from the boom in artificial intelligence (AI). Thanks to the rapid advances in technology, new smart hardware is reshaping how pupils will write and interact with teachers.

　　Equipped with a built-in mini camera, T-One, an AI-enabled smart pen can click up to 240 images（图像）per second, and store content handwritten on 400 A4-sized pages. Meanwhile, it can instantly digitalize students' handwritten notes, automatically evaluating their answers and potentially reducing the workload of teachers.

　　When students write with the smart pen on a piece of specially produced paper, which is printed with an invisible dot code pattern, the high-speed camera at the front of the pen can record the movement of the penpoint. And the pressure sensor will store all the information such as writing time and speed, and page number. Information thus collected is sent via Bluetooth to computers or other hand-held devices（设备）, which are equipped with Master Learner's "super teacher" system. The system can automatically review students' homework on behalf of teachers.

The system is said to be able to evaluate answers. Professor James, founder of Master Learner, said, "Handwriting has always played an irreplaceable role as a medium of interaction between teachers and students. Unlike typing on the keyboard, writing on paper is still the most preferred way in