The Communicative English for Chinese Learners (CECL) coursebook series, edited by Li Xiaoju, represents a landmark in language education by integrating cognitive development into activity design. This paper examines how CECL cultivates two higher-order cognitive capacities, namely, abstract thinking and strategic thinking, through its activity typology and organizational structure. Abstract thinking enables learners to extract concepts, build symbolic systems, and construct logical frameworks, while strategic thinking supports goal-oriented decision-making, scenario simulation, and adaptive communication. Although theoretically distinct, these two thinking modes are dialectically interwoven in CECL. Descriptive activities provide the cognitive foundation for abstraction through naming, symbolizing, and concept-networking. Social and hybrid activities serve as platforms for strategic thinking, requiring learners to analyze communicative situations, simulate outcomes, optimize choices, and adjust in real time. The paper argues that CECL constructs a sustainable cognitive ecosystem where abstract and strategic thinking reinforce each other in a spiral of ascending complexity. This design transcends traditional skill-based training and offers a paradigm for language education as holistic cognitive empowerment.