题目内容：
It is so easy to earn rewards! A wide range of partners whether you go To make traveling even easier, Air France offers you Frequency Plus(常旅客里程奖励计划)through an extensive network of our partners. Together, they give you endless opportunities to earn Miles and a wide choice of Rewards, from airline tickets, hotel room-nights, car rentals and more. Partners in China If you are a Frequency Plus member registered in china, you have even more choices with rewards from our local partners. For more information, please contact your local Air France office. First rewards start as low as 20,000 Miles! Your Temporary Card Start earning the Miles that will make you get your first Reward, now Remember, you will enjoy an extra 3,000 Bonus Miles(额外奖励历程) for your fist trip with Air France within 6 months of joining. Fly today and earn Rewards sooner! 1. Air France carries out its Frequency Plus_____.A、through its reduced ticket prices
B、through its extensive network of partners
C、by providing convenient flight schedules
D、by offering excellent services on board
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