What does the author imply about the raw materials used to make glass?
Câu hỏi:
What does the author imply about the raw materials used to make glass?
A. They were the same for centuries.
C. They are transparent.
D. They are very heavy.
Trả lời:
Chọn A
Thông tin: It was first made from a mixture of silica, line and an alkali such as soda or potash, and these remained the basic ingredients of glass until the development of lead glass in the seventeenth century. (Lần đầu tiên nó được làm từ hỗn hợp silica, đường và chất kiềm như soda hoặc kali, và những chất này vẫn là thành phần cơ bản của thủy tinh cho đến khi thủy tinh chì phát triển vào thế kỷ 17.)
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