丝绸之路是一条横贯亚洲、连接欧亚大陆的著名古代陆上商贸通道。丝绸之路已有2000余年的历史了，她的魅力是永恒的。今天，古老的丝绸之路沿线众多的历史名胜、文化古迹、壮丽的自然风光和多姿多彩的风土人情仍然吸引着成千上万来自世界各地的旅游者。历史上，骆驼曾经是丝绸之路上的主要交通工具；今天，游客可乘飞机、火车、汽车沿丝绸之路旅行，既快捷便利，又舒适安全。

A. Players should use the peaveys to push a heavy log into the water.< br>B. Players were expected to walk fast in the center of the log and spin it as fast as they could.< br>C. Players should force the opponent off the log into the water.< br>D. Players should not lose their balance and fall off into the water.

A. It is unclear what happens when synaesthesia starts.< br>B. It is still not known how the connections become so strong.< br>C. It is unclear as to whether synaesthesia can affect people’s sensation or not.< br>D. It is still not known why one stimulation evokes the sensation of another.