The word “it” in paragraph 2 refers to industrial architecture internal iron skeleton stone

Câu hỏi :

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

A. industrial architecture

B. internal iron skeleton

C. stone

D. strength

* Đáp án

B

* Hướng dẫn giải

Đáp án B

internal iron skeleton

Thông tin nằm ở đoạn 2: “By 1800 a complete internal iron skeleton for buildings had been developed in industrial architecture replacing traditional timber beams, but it generally remained concealed.”

=> it = internal iron skeleton

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