▌Longman Keystone 是 Longman Cornerstone 的銜接教材，課程規劃及教材編寫的原則相似，課程編寫架構完整，加上妥善規劃的語言學習策略，可讓學生的語言學習成效顯見。
▌全套共八冊(Building Bridges/A/B/C/D/E/F/Key to Learning)， 每冊六個不同的主題單元，每單元先以提問的方式引導學生從不同角度思考單元主題，啟動學習者的背景知識。
▌各式各樣跨學科閱讀性質的文章，幫助學習者邁向高階學術領域做準備。
＊此系列商品已絕版，售完為止。
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▌Pearson Longman Keystone is a multilevel reading and language development program that accelerates students’ academic achievement through scaffolded, sustained instruction and language development strategies.
▌Accelerates academic vocabulary acquisition through explicit instruction.
▌Develops transferable, cross-curricular academic skills through connected learning opportunities.
▌Provides an easy-to-use road map to academic success.
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ISBN：9780132339353
Longman Keystone Keys to Learning Student Book Only (絕版售完為止)
$2,200
ISBN：9780132083744
Longman Keystone Keys to Learning Poster (絕版售完為止)
$1,800
ISBN：9780132083805
Longman Keystone Keys to Learning Audio CD Only (絕版售完為止)
$1,000
ISBN：9780132411820
Longman Keystone Video DVD A Only (絕版售完為止)
$1,000
ISBN：9780132339797
Longman Keystone Video DVD C Only (絕版售完為止)
$1,000
ISBN：9780132447232
Longman Keystone Video DVD D Only (絕版售完為止)
$1,000
