阿摩線上測驗
40. In what order did the following protective hats appear?
a. fiberglass hats
b. hats with see-through shields
c. hats with canvas and leather
d. hats with tar over them
(A) d→c→a→b
(B) c→d→b→a
(C) c→b→a→d
(D) d→c→b→a
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統計： A(135), B(42), C(43), D(30), E(0) #2857097
統計： A(135), B(42), C(43), D(30), E(0) #2857097
