【多选题】道德是以善恶为标准,依靠( )来评价人们的行为,调节人与人、人与自然环境以及个人与社会之间关系的行为准则和规范的总和。
【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】()1.HSR is a type of passenger rail transport that operates faster than the normal speed of rail traffic.