—Yes, but it needs to go the clouds for hours.
A:across; through
B:through; across
C:across; across
D:through; through
瓣膜的存在保证了血液按一定方向流动。下列能正确表示血液流动方向的是
I will try my best to stop my son from _____ the same mistake.
央视大型纪录片《穿越海上丝绸之路》,立足于国家“一带一路”战略背景,以海上丝路沿线国家的人物风情故事切入,带领观众穿越时空,重新发现海上丝绸之路的厚重历史和文化精神。这表明了( )