《2025年经纶学典课时作业九年级英语上册译林版》

二、阅读理解
① It is widely known that China has the most advanced(先进的) high-speed railway network in the world. Now,the country is breaking its own speed record with CR450.
② CR450 can travel at 400 kilometres per hour on average,with a top speed hitting 453 km/h. Before this,the fastest high-speed train operating in a railway network in the world is China's CR400,which runs at 350 km/h on average.
③ Once put into use,for example,the CR450 will shorten the travel time from Beijing to Shanghai to just about two and a half hours,which takes at least four and a half hours at the moment.
④ "The key is not to make the train run fast but to have it brake(刹车) accurately(精准地) and steadily," Zhao Hongwei of the China Academy of Railway Sciences told CCTV News. The CR450 should have the same brake distance as the CR400,even though it travels a lot faster. It can also start braking more quickly,taking just 1.7 seconds compared to the 2.3 seconds needed for the CR400.
⑤ The engineers did lots of tests with the brakes to make the system better. All the data(数据) were saved in a smart system to make a digital model of the brake system for calculations. In addition to having a better braking system,the CR450 has the same noise level as the CR400.
⑥ Because of these advantages,people were very excited when the train made its debut on December 29,2024. It was the first time people knew what CR450 was exactly like.
( )1. How much faster is the average speed of CR450 than that of CR400?
A. 450 km/h. B. 300 km/h. C. 150 km/h. D. 50 km/h.
( )2. According to Zhao Hongwei,what is "the key" to CR450?
A. Braking accurately and steadily. B. Having shorter braking distance.
C. Increasing the speed on average. D. Starting to brake in a shorter time.
( )3. What does the underlined word "debut" mean in the last paragraph?
A. Latest plan for CR450. B. Greatest advantage.
C. First public appearance. D. Last energy system.
( )4. How is the text organized?(①= Paragraph 1,②= Paragraph 2,...)

答案： 1.D 2.A 3.C 4.D