【单选题】China's high speed rail network ________ plays a significant role in China's economy development. [ ]
【单选题】The high-speed rail _________Xiamen with Longyan is to open on June 30 th .
【判断题】President Barack Obama had planned to develop high-speed rail (HSR) systems across the United States, but it has met resistance.
【判断题】HSR is a type of passenger rail transport that operates faster than the normal speed of rail traffic.
【判断题】()1.HSR is a type of passenger rail transport that operates faster than the normal speed of rail traffic.