The word ‘which’ is paragraph 1 refers to ________

C

Từ “which” ở đoạn 1 ám chỉ đến........................

Granite: đá granit

These man: những con người này

Chairs: những cái ghế

Features: đặc điểm

Dẫn chứng: P1 [ He taught these men to dynamite, drill, carve, and finish the granite as they were hanging in midair in his specially devised chairs, which had many safety features.]

=>Chọn C