Which of the following statements best describes the author's attitude toward the rail and metro systems in China?
A. He is confident about its strength but has no personal attachment.
B. He feels that there is much space for further improvement.
C. He thinks highly of the service due to personal experience.
D. He believes that the service is up to international standards.
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Chang'e-5 mission has achieved many major breakthroughs, marking a great step forward in China's ______ industry.
The torch is designed for the Winter Olympic Games, with patterns of clouds and snowflakes painted from the bottom up to the flame, spiraling upward to ______ two overlapping fluttering ribbons.
The city will open 30 new domestic and international air routes bringing the total to 80 within five years, increasing the number of ______ cities to 150 and the passenger throughput to 20 million.
The Chinese government encourages accelerating the strategic development of urban air ______ in the country, and formulating relevant policies and standards for the healthy development of the industry.