What are common (A) known as “lead” pencils are not (B) lead, but (C) rather a mixture of graphite, clay

Câu hỏi :

What are common (A) known as “lead” pencils are not (B) lead, but (C) rather a mixture of graphite, clay and wax. (D)

A common

B not

C but

D and wax

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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