1 . 听双语新闻—语法填空
Chinese rail design standards win intl approval
Two international standards for high-speed railway infrastructure design and power supply, which were mainly drafted and developed by China, have been published by the International Union of Railways,
By the end of last year, China’s high-speed railway network stood at more than 40,000 kilometers, accounting for over two-thirds of the world’s total high-speed rail. China’s high-speed railway system spans different geographic conditions, including icy weather,
2 . 听下面一段对话，根据所听内容填空。
Yes, you can take a rest or
1. In winter what do the road workers work for?
2. Do the workers build the roads only for the airport?
3. What machines can clean up snow on the roads easily?
4. Where must snow be pushed?
5. Why can you take an easy trip in the winter time?
