专题02 完形填空-2023-2024学年九年级英语上学期期末备考 牛津上海版（试用本）

专题02 完形填空-2023-2024学年九年级英语上学期期末备考 牛津上海版（试用本） （2023上·上海普陀·九年级校考期末）“Vaccines” for Plants Although plants can’t get COVID-19, many other kinds of viruses can make them sick. Some of those viruses can cause huge 1 for crops. A ringspot (环斑病) virus, for example, harms papaya (番木瓜) fruit trees in Taiwan, China. There are many ways to fight against plant viruses, such as using medicines to treat leaves. But two girls at Taipei First Girls’ High School have found a new method: They give plants an electric shock. You might think of this shock treatment as a vaccine (疫苗), note Fu-Ru Li and Shao-Jyun Lai. Electric shocks should affect a plant in much the same way that a virus would—by causing its immune system (免疫系统) to start working. “It works to send messages to other leaves,” Fu-Ru explains. “It basically 2 a plant: ‘Oh, there’s a virus. You should prepare a defense!’” Many factors—such as heat and drought—can turn on a plant’s immune system. But an electric shock should achieve the same effects and without 3 the plant. At least, that was the idea. The young researchers now proved that it was 4 after their experiments. To put it into practice (付诸实践), the teens did some more experiments. By sticking two copper plates (铜板) into a pot, they produced a current (电流) that traveled through the soil and into the plant’s roots. One day, the students hope, farmers might be able to send such a current throughout a field, treating many plants 5 . “The idea of electro-vaccinating a whole field reminds me of a sci-fi movie,” Shao-Jyun says. But she also can imagine a world in which the idea is a 6 . “Before a seasonal viral infection (病毒感染), you can use it as a shot to improve the plants’ immunity,” she says. 1．A．mistakes B．problems C．relax D．worries 2．A．advises B．promises C．teaches D．warns 3．A．helping B．moving C．watering D．harming 4．A．different B．difficult C．effective D．popular 5．A．at all B．at least C．at once D．at present 6．A．disaster B．dream C．realit