：‌‌Ke Jie, the _____________ world No. 1 Go player, was invited to have a competition with AlphaGo. ‌‌‌ fertile‌ exhibit‌ reign‌ manufacture‌ interpret‌ forbid‌ prospect‌ ecology‌ ‌ ‌‌‌‌‌答案: reigning15、