阿摩線上測驗
34. Spider silk is lighter per unit weight than most man-made materials, _____ is about four to five times as strong as steel of the same weight.
(A) yet
(B) which
(C) there
(D) despite
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統計： A(0), B(1), C(0), D(0), E(0) #4041935
統計： A(0), B(1), C(0), D(0), E(0) #4041935
