河北安平中学实验部高一年级英语学科寒假作业2019年2月16日 第一部分 阅读理解（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题卡上将该项涂黑。AStarting CyclingWe have two services designed to give people the confidence and knowledge to cycle successfully.LessonsAll our instructors have been trained to National Standards level of “Bikeability”. This means you will be trained to a standard consistent across the whole country.There are 3 levels of skills to progress through. Children would start with levels 1 & 2, progressing from the playground or park to cycle on less busy local roads. Teenager and adult beginners can also learn levels 1 & 2 in an off-road and quiet environment.Confident teenagers and adults can broaden their skills by learning level 3, using multi-lane (多道) roads and larger roundabouts (环岛). We provide both a complete package of lessons for the beginner or individual lessons tailored to the client. You can ride a bike but dont feel confident about right turns on multi-lane roads. Whatever the needwe can address and practice until perfect!Everyone can be taught to ride a bike!We train both adults and children.We cover London Zones 1 & 2The cost is 30 per hour.Guided RideWe know that riding on the roads in London can be scary, and if you have to navigate (确定行车路线) as well it can become a real hard task! The Guided Ride service takes all the stress out of it for you by providing the following:Route planned in advance to suit your skill level. Route map provided to you.Cycle and equipment checked. We will teach you a simple method to check basic roadworthiness (车辆性能) of your bike that you can perform on a weekly basis.Route discussed and focus given to any areas requiring special attention.Cycle along with the instructor close behind. Here the traffic can be controlled by the instructor and rider observed.Occasionally stopping to discuss events.We currently cover London Zones 1 & 2. Please contact us if your requirements are outside of these areas.Cost 3021. Where can Level 1 & 2 lessons for adult beginners be carried out？A. Off road.B. Near large roundabouts.C. On busy local roads.D. On multi-lane roads.22. What service does the Guided Ride mainly provide?.A. They help you to be familiar with London roads.B. They check your cycle and equipment every week.C. They let users experience the busiest road in London.D. They ensure users ride safely in London Zones 1 & 2.23. Who is the text probably intended for ?A. Bike riding lovers.B. Children and teenagers.C. Travelers in London.D. Parents loving cycling.BWork started this week on next seasons flu vaccine (疫苗), with experts working off forecasts about which types of the flu virus will be making the rounds. But dont expect any improvements. Flu experts are already admitting that most vaccines will give at best basic protection, because theyre based on old-fashioned technology. Its not a new problem, but one that the slow-moving world of drug and vaccine production seems helpless to improve upon.Every flu vaccine is a cocktail, aimed at either three or four of the most common flu types. Flu vaccines must be reformulated every year, because flu viruses develop constantly in a process called antigenic drift. In February, global flu experts gather to trade notes on what viruses are circulating in different countries and to come to an agreement on which types the next vaccines should be formulated to target.In recent years, flu vaccines have been based on H1N1, H3N2 and either one or two types of influenza B virus. Each of these has a “reference” type, which is used to make seed virus. Producers inject the seed types into eggs and incubate (孵) them as the virus grows. Then they purify the virus, and either weaken it or kill it to make a vaccine.Using eggs is a tricky and unpredictable process. Sometimes the virus doesnt grow well in eggs, which can mean less vaccine than expected. The result is a flu vaccine that doesnt offer much protection. “As long as we have eggs we are going to have this problem,” said Scott Hensley, a flu virus expert, “The only solution is not to depend on eggs.”Flu is a major killer. The 20172018 season has been a severe one, hitting the entire U.S. with widespread influenza infection (传染) at once for weeks on end, and killing 97 children so far. Against this threat, even a less satisfying flu vaccine will definitely help. “Even when you have these mismatches it will not prevent infection but likely prevent disease severity,” said Hensley.24. Why does next season flu vaccine fail to improve? A. It has offered the best protection. B. Experts cant forecast the flu types. C. It is based on outdated technology. D. Experts are unwilling to respond to changes.25. According to Paragraph 2, what do flu experts do in February? A. Exchange views on the virus types next season. B. Get together and discuss how to improve flu vac