选择合适的搭配。

初升的____       园丁       

神奇的____       花朵       

美丽的____       景色       

辛勤的____       红日       

①坚持客观与主观具体的历史的统一      ②坚持事物发展的前进性和曲折性的统一

③坚持主观能动性和客观规律性的统一    ④把握绝对运动和相对静止的统一

D

     It is reported that a Chinese commercial flight was forced to land at an airport in Chengdu after a mechanical failure.
     The flight, Flight 3U8633, which is operated by Sichuan Airlines, was flying from Southwest China’s Chongqing to Lhasa, capital of Tibet. It took off at 6:27 am on Monday May 14th. Unfortunately, at around 7 am and 9,800 meters after it took off, something unexpected happened. So the flight was forced to turn to Chengdu, capital of Sichuan province to land.
     According to the Civil Aviation Administration of China (CAAC)(中国民航局), part of the cockpit window broke as the Airbus A319 flew over Chengdu. The aircrew enacted emergency code 7,700 and had to land in Chengdu. Luckily, all passengers on the plane are safe, although the co-pilot got injuries to the face and waist. And another crew member was slightly hurt during the emergency landing, according to the CAAC.
     Sichuan Airlines said that they are now beginning to look into the causes of the accident. The plane landed in Chengdu at 7:46 am on Monday.
     Altogether, there were 119 passengers and nine crew members on board, according to the airline, which has arranged another flight to take the passengers to Lhasa.

为了乘客的安全，北京地铁1号线在距离车体一定的位置设置了一条黄色的安全线。请你用相关的物理知识解释为什么要设置安全线。