Q：According to the passage, rock does not always have to be attractive to be useful in the building trades because ________.
(A). it can be used to make concrete, something not meant to be attractive
(B). the size and shape of the rock can be changed for other purposes
(C). sand and gravel are less useful than rock
(D). rock can be crushed for easy disposal
2 comments:
The answer is B.
Also, take notes here,
gravel 碎石
the earth crust 地殼
concrete and steel 鋼筋混泥土
trim 裝飾
durable 耐用持久的
I spent a lot of time reading this article, ummmm, it is a little hard for me to understand. But i also had learned a lot of different stones' names, thanks a lot.
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